51639360 has 56 divisors (see below), whose sum is σ = 163958016. Its totient is φ = 13770240.

The previous prime is 51639349. The next prime is 51639389. The reversal of 51639360 is 6393615.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25936 + ... + 27855.

Almost surely, 2^51639360 is an apocalyptic number.

It is an amenable number.

51639360 is an abundant number, since it is smaller than the sum of its proper divisors (112318656).

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

51639360 is a wasteful number, since it uses less digits than its factorization.

51639360 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53811 (or 53801 counting only the distinct ones).

The product of its (nonzero) digits is 14580, while the sum is 33.

The square root of 51639360 is about 7186.0531587235. The cubic root of 51639360 is about 372.3862331433.

The spelling of 51639360 in words is "fifty-one million, six hundred thirty-nine thousand, three hundred sixty".