51640312 has 16 divisors (see below), whose sum is σ = 96939360. Its totient is φ = 25789824.

The previous prime is 51640297. The next prime is 51640363. The reversal of 51640312 is 21304615.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4513 + ... + 11119.

It is an arithmetic number, because the mean of its divisors is an integer number (6058710).

Almost surely, 2^51640312 is an apocalyptic number.

It is an amenable number.

51640312 is a deficient number, since it is larger than the sum of its proper divisors (45299048).

51640312 is a wasteful number, since it uses less digits than its factorization.

51640312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7590 (or 7586 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 51640312 is about 7186.1193978391. The cubic root of 51640312 is about 372.3885215109.

Adding to 51640312 its reverse (21304615), we get a palindrome (72944927).

The spelling of 51640312 in words is "fifty-one million, six hundred forty thousand, three hundred twelve".