51486864 has 120 divisors (see below), whose sum is σ = 157391712. Its totient is φ = 14376960.

The previous prime is 51486859. The next prime is 51486889. The reversal of 51486864 is 46868415.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 88944 + ... + 89520.

Almost surely, 2^51486864 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51486864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78695856).

51486864 is an abundant number, since it is smaller than the sum of its proper divisors (105904848).

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

51486864 is a wasteful number, since it uses less digits than its factorization.

51486864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 625 (or 606 counting only the distinct ones).

The product of its digits is 184320, while the sum is 42.

The square root of 51486864 is about 7175.4347603473. The cubic root of 51486864 is about 372.0193075885.

It can be divided in two parts, 514 and 86864, that added together give a palindrome (87378).

The spelling of 51486864 in words is "fifty-one million, four hundred eighty-six thousand, eight hundred sixty-four".