51039680 has 28 divisors (see below), whose sum is σ = 121539000. Its totient is φ = 20415744.

The previous prime is 51039673. The next prime is 51039683. The reversal of 51039680 is 8693015.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51039683) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 79430 + ... + 80069.

Almost surely, 2^51039680 is an apocalyptic number.

It is an amenable number.

51039680 is an abundant number, since it is smaller than the sum of its proper divisors (70499320).

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

51039680 is a wasteful number, since it uses less digits than its factorization.

51039680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159516 (or 159506 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 51039680 is about 7144.2060440612. The cubic root of 51039680 is about 370.9391287873.

It can be divided in two parts, 5 and 1039680, that multiplied together give a square (5198400 = 2280²).

The spelling of 51039680 in words is "fifty-one million, thirty-nine thousand, six hundred eighty".