51616836 has 18 divisors (see below), whose sum is σ = 130475982. Its totient is φ = 17205600.

The previous prime is 51616801. The next prime is 51616843. The reversal of 51616836 is 63861615.

It is a happy number.

51616836 is a `hidden beast` number, since 5 + 1 + 616 + 8 + 36 = 666.

It can be written as a sum of positive squares in only one way, i.e., 51408900 + 207936 = 7170^2 + 456^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 1433801 = 51616836 / (5 + 1 + 6 + 1 + 6 + 8 + 3 + 6).

It is a self number, because there is not a number n which added to its sum of digits gives 51616836.

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, 716865 + ... + 716936.

Almost surely, 2^51616836 is an apocalyptic number.

It is an amenable number.

51616836 is an abundant number, since it is smaller than the sum of its proper divisors (78859146).

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

51616836 is a wasteful number, since it uses less digits than its factorization.

51616836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1433811 (or 1433806 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 51616836 is about 7184.4857853572. The cubic root of 51616836 is about 372.3320829285.

The spelling of 51616836 in words is "fifty-one million, six hundred sixteen thousand, eight hundred thirty-six".