51685272 has 24 divisors (see below), whose sum is σ = 139981140. Its totient is φ = 17228400.

The previous prime is 51685267. The next prime is 51685273. The reversal of 51685272 is 27258615.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51685273) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 358854 + ... + 358997.

Almost surely, 2^51685272 is an apocalyptic number.

It is an amenable number.

51685272 is an abundant number, since it is smaller than the sum of its proper divisors (88295868).

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

51685272 is a wasteful number, since it uses less digits than its factorization.

51685272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 717863 (or 717856 counting only the distinct ones).

The product of its digits is 33600, while the sum is 36.

The square root of 51685272 is about 7189.2469703022. The cubic root of 51685272 is about 372.4965619850.

It can be divided in two parts, 5168 and 5272, that added together give a triangular number (10440 = T₁₄₄).

The spelling of 51685272 in words is "fifty-one million, six hundred eighty-five thousand, two hundred seventy-two".