51204564 has 36 divisors (see below), whose sum is σ = 129650976. Its totient is φ = 17039568.

The previous prime is 51204541. The next prime is 51204583. The reversal of 51204564 is 46540215.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 41257 + ... + 42479.

It is an arithmetic number, because the mean of its divisors is an integer number (3601416).

Almost surely, 2^51204564 is an apocalyptic number.

It is an amenable number.

51204564 is an abundant number, since it is smaller than the sum of its proper divisors (78446412).

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

51204564 is a wasteful number, since it uses less digits than its factorization.

51204564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2396 (or 2391 counting only the distinct ones).

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

The square root of 51204564 is about 7155.7364400878. The cubic root of 51204564 is about 371.3381398047.

Adding to 51204564 its reverse (46540215), we get a palindrome (97744779).

The spelling of 51204564 in words is "fifty-one million, two hundred four thousand, five hundred sixty-four".