51636616 has 16 divisors (see below), whose sum is σ = 102514140. Its totient is φ = 24299520.

The previous prime is 51636601. The next prime is 51636647. The reversal of 51636616 is 61663615.

It can be written as a sum of positive squares in 2 ways, for example, as 39062500 + 12574116 = 6250^2 + 3546^2 .

It is a super-2 number, since 2×51636616² = 5332680223862912, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 189705 + ... + 189976.

Almost surely, 2^51636616 is an apocalyptic number.

It is an amenable number.

51636616 is a deficient number, since it is larger than the sum of its proper divisors (50877524).

51636616 is a wasteful number, since it uses less digits than its factorization.

51636616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379704 (or 379700 counting only the distinct ones).

The product of its digits is 19440, while the sum is 34.

The square root of 51636616 is about 7185.8622307974. The cubic root of 51636616 is about 372.3796371029.

The spelling of 51636616 in words is "fifty-one million, six hundred thirty-six thousand, six hundred sixteen".