51865808 has 20 divisors (see below), whose sum is σ = 100826880. Its totient is φ = 25845984.

The previous prime is 51865739. The next prime is 51865813. The reversal of 51865808 is 80856815.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 368 + ... + 10191.

It is an arithmetic number, because the mean of its divisors is an integer number (5041344).

Almost surely, 2^51865808 is an apocalyptic number.

It is an amenable number.

51865808 is a deficient number, since it is larger than the sum of its proper divisors (48961072).

51865808 is a wasteful number, since it uses less digits than its factorization.

51865808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10874 (or 10868 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 41.

The square root of 51865808 is about 7201.7919992180. The cubic root of 51865808 is about 372.9297665730.

It can be divided in two parts, 5 and 1865808, that multiplied together give a triangular number (9329040 = T₄₃₁₉).

The spelling of 51865808 in words is "fifty-one million, eight hundred sixty-five thousand, eight hundred eight".