51820808 has 24 divisors (see below), whose sum is σ = 105215850. Its totient is φ = 23916672.

The previous prime is 51820793. The next prime is 51820819. The reversal of 51820808 is 80802815.

It can be written as a sum of positive squares in 3 ways, for example, as 25421764 + 26399044 = 5042^2 + 5138^2 .

It is a super-2 number, since 2×51820808² = 5370792283545728, which contains 22 as substring.

It is a nialpdrome in base 13.

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, 17813 + ... + 20516.

Almost surely, 2^51820808 is an apocalyptic number.

It is an amenable number.

51820808 is an abundant number, since it is smaller than the sum of its proper divisors (53395042).

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

51820808 is a wasteful number, since it uses less digits than its factorization.

51820808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38361 (or 38344 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 32.

The square root of 51820808 is about 7198.6670988455. The cubic root of 51820808 is about 372.8218811412.

The spelling of 51820808 in words is "fifty-one million, eight hundred twenty thousand, eight hundred eight".