53216865 has 32 divisors (see below), whose sum is σ = 101888640. Its totient is φ = 26198208.

The previous prime is 53216857. The next prime is 53216873. The reversal of 53216865 is 56861235.

53216865 is a `hidden beast` number, since 532 + 1 + 68 + 65 = 666.

It is an interprime number because it is at equal distance from previous prime (53216857) and next prime (53216873).

It is not a de Polignac number, because 53216865 - 2³ = 53216857 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13407 + ... + 16916.

It is an arithmetic number, because the mean of its divisors is an integer number (3184020).

Almost surely, 2^53216865 is an apocalyptic number.

It is an amenable number.

53216865 is a deficient number, since it is larger than the sum of its proper divisors (48671775).

53216865 is a wasteful number, since it uses less digits than its factorization.

53216865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30350 (or 30344 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 53216865 is about 7294.9890335764. The cubic root of 53216865 is about 376.1402096117.

The spelling of 53216865 in words is "fifty-three million, two hundred sixteen thousand, eight hundred sixty-five".