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57391407 = 3217233701
BaseRepresentation
bin1101101011101…
…1100100101111
310222222210012200
43122323210233
5104143011112
65410032543
71264550613
oct332734457
9128883180
1057391407
112a43a017
1217278753
13bb75818
14789d343
155089cdc
hex36bb92f

57391407 has 12 divisors (see below), whose sum is σ = 82969224. Its totient is φ = 38228400.

The previous prime is 57391393. The next prime is 57391459. The reversal of 57391407 is 70419375.

It is a happy number.

It is not a de Polignac number, because 57391407 - 24 = 57391391 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57391207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13657 + ... + 17357.

It is an arithmetic number, because the mean of its divisors is an integer number (6914102).

Almost surely, 257391407 is an apocalyptic number.

57391407 is a deficient number, since it is larger than the sum of its proper divisors (25577817).

57391407 is a wasteful number, since it uses less digits than its factorization.

57391407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5430 (or 5427 counting only the distinct ones).

The product of its (nonzero) digits is 26460, while the sum is 36.

The square root of 57391407 is about 7575.7116497396. The cubic root of 57391407 is about 385.7289993799.

The spelling of 57391407 in words is "fifty-seven million, three hundred ninety-one thousand, four hundred seven".

Divisors: 1 3 9 1723 3701 5169 11103 15507 33309 6376823 19130469 57391407