51947928 has 24 divisors (see below), whose sum is σ = 140692500. Its totient is φ = 17315952.

The previous prime is 51947911. The next prime is 51947939. The reversal of 51947928 is 82974915.

51947928 is a `hidden beast` number, since 519 + 47 + 92 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

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 5 ways as a sum of consecutive naturals, for example, 360678 + ... + 360821.

Almost surely, 2^51947928 is an apocalyptic number.

It is an amenable number.

51947928 is an abundant number, since it is smaller than the sum of its proper divisors (88744572).

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

51947928 is a wasteful number, since it uses less digits than its factorization.

51947928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 721511 (or 721504 counting only the distinct ones).

The product of its digits is 181440, while the sum is 45.

The square root of 51947928 is about 7207.4911030122. The cubic root of 51947928 is about 373.1264847630.

The spelling of 51947928 in words is "fifty-one million, nine hundred forty-seven thousand, nine hundred twenty-eight".