51657172 has 48 divisors (see below), whose sum is σ = 110073600. Its totient is φ = 21163296.

The previous prime is 51657163. The next prime is 51657173. The reversal of 51657172 is 27175615.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51657173) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30738 + ... + 32374.

It is an arithmetic number, because the mean of its divisors is an integer number (2293200).

Almost surely, 2^51657172 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 51657172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (55036800).

51657172 is an abundant number, since it is smaller than the sum of its proper divisors (58416428).

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

51657172 is a wasteful number, since it uses less digits than its factorization.

51657172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1685 (or 1669 counting only the distinct ones).

The product of its digits is 14700, while the sum is 34.

The square root of 51657172 is about 7187.2923970018. The cubic root of 51657172 is about 372.4290440347.

The spelling of 51657172 in words is "fifty-one million, six hundred fifty-seven thousand, one hundred seventy-two".