51236864 has 52 divisors (see below), whose sum is σ = 117164064. Its totient is φ = 21946368.

The previous prime is 51236833. The next prime is 51236869. The reversal of 51236864 is 46863215.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51236869) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27779 + ... + 29565.

Almost surely, 2^51236864 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 51236864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (58582032).

51236864 is an abundant number, since it is smaller than the sum of its proper divisors (65927200).

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

51236864 is an equidigital number, since it uses as much as digits as its factorization.

51236864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1818 (or 1796 counting only the distinct ones).

The product of its digits is 34560, while the sum is 35.

The square root of 51236864 is about 7157.9930148052. The cubic root of 51236864 is about 371.4162038147.

The spelling of 51236864 in words is "fifty-one million, two hundred thirty-six thousand, eight hundred sixty-four".