51865272 has 40 divisors (see below), whose sum is σ = 145272600. Its totient is φ = 17288208.

The previous prime is 51865223. The next prime is 51865273. The reversal of 51865272 is 27256815.

It is a happy number.

51865272 is a `hidden beast` number, since 51 + 86 + 527 + 2 = 666.

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 (51865273) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 39372 + ... + 40667.

It is an arithmetic number, because the mean of its divisors is an integer number (3631815).

Almost surely, 2^51865272 is an apocalyptic number.

It is an amenable number.

51865272 is an abundant number, since it is smaller than the sum of its proper divisors (93407328).

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

51865272 is a wasteful number, since it uses less digits than its factorization.

51865272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80057 (or 80044 counting only the distinct ones).

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

The square root of 51865272 is about 7201.7547861615. The cubic root of 51865272 is about 372.9284819050.

The spelling of 51865272 in words is "fifty-one million, eight hundred sixty-five thousand, two hundred seventy-two".