51523904 has 14 divisors (see below), whose sum is σ = 102242874. Its totient is φ = 25761920.

The previous prime is 51523903. The next prime is 51523931. The reversal of 51523904 is 40932515.

It can be written as a sum of positive squares in only one way, i.e., 49674304 + 1849600 = 7048^2 + 1360^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51523903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 402467 + ... + 402594.

Almost surely, 2^51523904 is an apocalyptic number.

It is an amenable number.

51523904 is a deficient number, since it is larger than the sum of its proper divisors (50718970).

51523904 is an equidigital number, since it uses as much as digits as its factorization.

51523904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 805073 (or 805063 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 51523904 is about 7178.0153245866. The cubic root of 51523904 is about 372.1084972770.

The spelling of 51523904 in words is "fifty-one million, five hundred twenty-three thousand, nine hundred four".