51402564 has 36 divisors (see below), whose sum is σ = 131507376. Its totient is φ = 16926768.

The previous prime is 51402563. The next prime is 51402607. The reversal of 51402564 is 46520415.

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (51402563) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5614 + ... + 11589.

Almost surely, 2^51402564 is an apocalyptic number.

It is an amenable number.

51402564 is an abundant number, since it is smaller than the sum of its proper divisors (80104812).

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

51402564 is a wasteful number, since it uses less digits than its factorization.

51402564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17296 (or 17291 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 51402564 is about 7169.5581453811. The cubic root of 51402564 is about 371.8161595956.

Adding to 51402564 its reverse (46520415), we get a palindrome (97922979).

It can be divided in two parts, 514025 and 64, that added together give a square (514089 = 717²).

The spelling of 51402564 in words is "fifty-one million, four hundred two thousand, five hundred sixty-four".