51325664 has 24 divisors (see below), whose sum is σ = 108821160. Its totient is φ = 23688576.

The previous prime is 51325661. The next prime is 51325691. The reversal of 51325664 is 46652315.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a self number, because there is not a number n which added to its sum of digits gives 51325664.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51325661) 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, 61274 + ... + 62105.

It is an arithmetic number, because the mean of its divisors is an integer number (4534215).

Almost surely, 2^51325664 is an apocalyptic number.

It is an amenable number.

51325664 is an abundant number, since it is smaller than the sum of its proper divisors (57495496).

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

51325664 is a wasteful number, since it uses less digits than its factorization.

51325664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123402 (or 123394 counting only the distinct ones).

The product of its digits is 21600, while the sum is 32.

The square root of 51325664 is about 7164.1931855583. The cubic root of 51325664 is about 371.6306504767.

Adding to 51325664 its reverse (46652315), we get a palindrome (97977979).

The spelling of 51325664 in words is "fifty-one million, three hundred twenty-five thousand, six hundred sixty-four".