51238564 has 24 divisors (see below), whose sum is σ = 97002360. Its totient is φ = 23541504.

The previous prime is 51238559. The next prime is 51238589. The reversal of 51238564 is 46583215.

51238564 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 7784100 + 43454464 = 2790^2 + 6592^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10002 + ... + 14230.

It is an arithmetic number, because the mean of its divisors is an integer number (4041765).

Almost surely, 2^51238564 is an apocalyptic number.

It is an amenable number.

51238564 is a deficient number, since it is larger than the sum of its proper divisors (45763796).

51238564 is a wasteful number, since it uses less digits than its factorization.

51238564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4479 (or 4477 counting only the distinct ones).

The product of its digits is 28800, while the sum is 34.

The square root of 51238564 is about 7158.1117621898. Note that the first 3 decimals coincide. The cubic root of 51238564 is about 371.4203115379.

The spelling of 51238564 in words is "fifty-one million, two hundred thirty-eight thousand, five hundred sixty-four".