51285904 has 20 divisors (see below), whose sum is σ = 102572800. Its totient is φ = 24815520.

The previous prime is 51285893. The next prime is 51285907. The reversal of 51285904 is 40958215.

51285904 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 51285904.

It is not an unprimeable number, because it can be changed into a prime (51285907) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51204 + ... + 52195.

It is an arithmetic number, because the mean of its divisors is an integer number (5128640).

Almost surely, 2^51285904 is an apocalyptic number.

It is an amenable number.

51285904 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

51285904 is a wasteful number, since it uses less digits than its factorization.

51285904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103438 (or 103432 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 34.

The square root of 51285904 is about 7161.4177367334. The cubic root of 51285904 is about 371.5346630724.

The spelling of 51285904 in words is "fifty-one million, two hundred eighty-five thousand, nine hundred four".