53815816 has 16 divisors (see below), whose sum is σ = 101169900. Its totient is φ = 26837184.

The previous prime is 53815781. The next prime is 53815823. The reversal of 53815816 is 61851835.

It can be written as a sum of positive squares in 2 ways, for example, as 44488900 + 9326916 = 6670^2 + 3054^2 .

It is a super-2 number, since 2×53815816² = 5792284103491712, which contains 22 as substring.

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, 5535 + ... + 11758.

Almost surely, 2^53815816 is an apocalyptic number.

It is an amenable number.

53815816 is a deficient number, since it is larger than the sum of its proper divisors (47354084).

53815816 is a wasteful number, since it uses less digits than its factorization.

53815816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17688 (or 17684 counting only the distinct ones).

The product of its digits is 28800, while the sum is 37.

The square root of 53815816 is about 7335.9263900342. The cubic root of 53815816 is about 377.5460897193.

The spelling of 53815816 in words is "fifty-three million, eight hundred fifteen thousand, eight hundred sixteen".