51809876 has 24 divisors (see below), whose sum is σ = 91885920. Its totient is φ = 25559712.

The previous prime is 51809831. The next prime is 51809893. The reversal of 51809876 is 67890815.

It is a happy number.

It is a super-2 number, since 2×51809876² = 5368526502270752, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 149135 + ... + 149481.

It is an arithmetic number, because the mean of its divisors is an integer number (3828580).

Almost surely, 2^51809876 is an apocalyptic number.

It is an amenable number.

51809876 is a deficient number, since it is larger than the sum of its proper divisors (40076044).

51809876 is a wasteful number, since it uses less digits than its factorization.

51809876 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 743 (or 741 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 44.

The square root of 51809876 is about 7197.9077515623. The cubic root of 51809876 is about 372.7956627449.

The spelling of 51809876 in words is "fifty-one million, eight hundred nine thousand, eight hundred seventy-six".