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57147990 = 2355983389
BaseRepresentation
bin1101101000000…
…0001001010110
310222112102022020
43122000021112
5104112213430
65400514010
71262515134
oct332001126
9128472266
1057147990
112a293149
121717b906
13babbaa3
147838754
15503cb10
hex3680256

57147990 has 64 divisors (see below), whose sum is σ = 141523200. Its totient is φ = 14762624.

The previous prime is 57147983. The next prime is 57148019. The reversal of 57147990 is 9974175.

It is a happy number.

It is a super-2 number, since 2×571479902 = 6531785522080200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 146716 + ... + 147104.

It is an arithmetic number, because the mean of its divisors is an integer number (2211300).

Almost surely, 257147990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 57147990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70761600).

57147990 is an abundant number, since it is smaller than the sum of its proper divisors (84375210).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

57147990 is a wasteful number, since it uses less digits than its factorization.

57147990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 541.

The product of its (nonzero) digits is 79380, while the sum is 42.

The square root of 57147990 is about 7559.6289591487. The cubic root of 57147990 is about 385.1828894379.

The spelling of 57147990 in words is "fifty-seven million, one hundred forty-seven thousand, nine hundred ninety".

Divisors: 1 2 3 5 6 10 15 30 59 83 118 166 177 249 295 354 389 415 498 590 778 830 885 1167 1245 1770 1945 2334 2490 3890 4897 5835 9794 11670 14691 22951 24485 29382 32287 45902 48970 64574 68853 73455 96861 114755 137706 146910 161435 193722 229510 322870 344265 484305 688530 968610 1904933 3809866 5714799 9524665 11429598 19049330 28573995 57147990