51069864 has 32 divisors (see below), whose sum is σ = 127908000. Its totient is φ = 16992192.

The previous prime is 51069857. The next prime is 51069881. The reversal of 51069864 is 46896015.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14202 + ... + 17430.

It is an arithmetic number, because the mean of its divisors is an integer number (3997125).

Almost surely, 2^51069864 is an apocalyptic number.

It is an amenable number.

51069864 is an abundant number, since it is smaller than the sum of its proper divisors (76838136).

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

51069864 is a wasteful number, since it uses less digits than its factorization.

51069864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3897 (or 3893 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 39.

The square root of 51069864 is about 7146.3182128982. The cubic root of 51069864 is about 371.0122367447.

Subtracting from 51069864 its reverse (46896015), we obtain a square (4173849 = 2043²).

The spelling of 51069864 in words is "fifty-one million, sixty-nine thousand, eight hundred sixty-four".