51860865 has 48 divisors (see below), whose sum is σ = 99185472. Its totient is φ = 23054976.

The previous prime is 51860857. The next prime is 51860869. The reversal of 51860865 is 56806815.

It is not a de Polignac number, because 51860865 - 2³ = 51860857 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51860869) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 26242 + ... + 28148.

It is an arithmetic number, because the mean of its divisors is an integer number (2066364).

Almost surely, 2^51860865 is an apocalyptic number.

It is an amenable number.

51860865 is a deficient number, since it is larger than the sum of its proper divisors (47324607).

51860865 is a wasteful number, since it uses less digits than its factorization.

51860865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1966 (or 1959 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 39.

The square root of 51860865 is about 7201.4488125654. The cubic root of 51860865 is about 372.9179190093.

It can be divided in two parts, 51860 and 865, that added together give a palindrome (52725).

The spelling of 51860865 in words is "fifty-one million, eight hundred sixty thousand, eight hundred sixty-five".