51086868 has 24 divisors (see below), whose sum is σ = 136231872. Its totient is φ = 14596224.

The previous prime is 51086857. The next prime is 51086873. The reversal of 51086868 is 86868015.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 304005 + ... + 304172.

It is an arithmetic number, because the mean of its divisors is an integer number (5676328).

Almost surely, 2^51086868 is an apocalyptic number.

It is an amenable number.

51086868 is an abundant number, since it is smaller than the sum of its proper divisors (85145004).

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

51086868 is a wasteful number, since it uses less digits than its factorization.

51086868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 608191 (or 608189 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 42.

The square root of 51086868 is about 7147.5078174144. The cubic root of 51086868 is about 371.0534090496.

It can be divided in two parts, 510 and 86868, that added together give a palindrome (87378).

The spelling of 51086868 in words is "fifty-one million, eighty-six thousand, eight hundred sixty-eight".