51008564 has 12 divisors (see below), whose sum is σ = 92343300. Its totient is φ = 24624768.

The previous prime is 51008537. The next prime is 51008567. The reversal of 51008564 is 46580015.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 26604964 + 24403600 = 5158^2 + 4940^2 .

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51008567) 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, 219749 + ... + 219980.

It is an arithmetic number, because the mean of its divisors is an integer number (7695275).

Almost surely, 2^51008564 is an apocalyptic number.

It is an amenable number.

51008564 is a deficient number, since it is larger than the sum of its proper divisors (41334736).

51008564 is a wasteful number, since it uses less digits than its factorization.

51008564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 439762 (or 439760 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 29.

The square root of 51008564 is about 7142.0280033055. The cubic root of 51008564 is about 370.8637332763.

Adding to 51008564 its reverse (46580015), we get a palindrome (97588579).

The spelling of 51008564 in words is "fifty-one million, eight thousand, five hundred sixty-four".