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51313080 = 233571337127
BaseRepresentation
bin1100001110111…
…1100110111000
310120112222022110
43003233212320
5101114004310
65031452320
71162103550
oct303574670
9116488273
1051313080
1126a68305
12152270a0
13a827c90
146b5a160
154788d20
hex30ef9b8

51313080 has 256 divisors, whose sum is σ = 196116480. Its totient is φ = 10450944.

The previous prime is 51313033. The next prime is 51313081. The reversal of 51313080 is 8031315.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51313081) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 403977 + ... + 404103.

It is an arithmetic number, because the mean of its divisors is an integer number (766080).

Almost surely, 251313080 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51313080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98058240).

51313080 is an abundant number, since it is smaller than the sum of its proper divisors (144803400).

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

51313080 is a wasteful number, since it uses less digits than its factorization.

51313080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198 (or 194 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 51313080 is about 7163.3148751119. The cubic root of 51313080 is about 371.6002759233.

Adding to 51313080 its reverse (8031315), we get a palindrome (59344395).

The spelling of 51313080 in words is "fifty-one million, three hundred thirteen thousand, eighty".