51265278 has 32 divisors (see below), whose sum is σ = 114808320. Its totient is φ = 16955640.

The previous prime is 51265271. The next prime is 51265283. The reversal of 51265278 is 87256215.

It is a happy number.

51265278 is a `hidden beast` number, since 5 + 126 + 527 + 8 = 666.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51265271) 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 15 ways as a sum of consecutive naturals, for example, 3451 + ... + 10697.

It is an arithmetic number, because the mean of its divisors is an integer number (3587760).

Almost surely, 2^51265278 is an apocalyptic number.

51265278 is an abundant number, since it is smaller than the sum of its proper divisors (63543042).

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

51265278 is a wasteful number, since it uses less digits than its factorization.

51265278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7389 (or 7383 counting only the distinct ones).

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

The square root of 51265278 is about 7159.9775139312. The cubic root of 51265278 is about 371.4848488550.

It can be divided in two parts, 5126 and 5278, that added together give a square (10404 = 102²).

The spelling of 51265278 in words is "fifty-one million, two hundred sixty-five thousand, two hundred seventy-eight".