51640264 has 32 divisors (see below), whose sum is σ = 104569920. Its totient is φ = 23766336.

The previous prime is 51640243. The next prime is 51640289. The reversal of 51640264 is 46204615.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70669 + ... + 71395.

It is an arithmetic number, because the mean of its divisors is an integer number (3267810).

Almost surely, 2^51640264 is an apocalyptic number.

It is an amenable number.

51640264 is an abundant number, since it is smaller than the sum of its proper divisors (52929656).

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

51640264 is a wasteful number, since it uses less digits than its factorization.

51640264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1429 (or 1425 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 51640264 is about 7186.1160580664. The cubic root of 51640264 is about 372.3884061317.

Adding to 51640264 its reverse (46204615), we get a palindrome (97844879).

The spelling of 51640264 in words is "fifty-one million, six hundred forty thousand, two hundred sixty-four".