51608991828 has 24 divisors (see below), whose sum is σ = 124305529600. Its totient is φ = 16648061760.

The previous prime is 51608991823. The next prime is 51608991869. The reversal of 51608991828 is 82819980615.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51608991823) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69366553 + ... + 69367296.

Almost surely, 2^51608991828 is an apocalyptic number.

It is an amenable number.

51608991828 is an abundant number, since it is smaller than the sum of its proper divisors (72696537772).

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

51608991828 is a wasteful number, since it uses less digits than its factorization.

51608991828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138733887 (or 138733885 counting only the distinct ones).

The product of its (nonzero) digits is 2488320, while the sum is 57.

The spelling of 51608991828 in words is "fifty-one billion, six hundred eight million, nine hundred ninety-one thousand, eight hundred twenty-eight".