216653634 has 24 divisors (see below), whose sum is σ = 475849452. Its totient is φ = 71228160.

The previous prime is 216653623. The next prime is 216653641. The reversal of 216653634 is 436356612.

216653634 is a `hidden beast` number, since 2 + 16 + 6 + 5 + 3 + 634 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 203148009 + 13505625 = 14253^2 + 3675^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 81127 + ... + 83754.

Almost surely, 2^216653634 is an apocalyptic number.

216653634 is an abundant number, since it is smaller than the sum of its proper divisors (259195818).

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

216653634 is a wasteful number, since it uses less digits than its factorization.

216653634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164962 (or 164959 counting only the distinct ones).

The product of its digits is 77760, while the sum is 36.

The square root of 216653634 is about 14719.1587395476. The cubic root of 216653634 is about 600.6046072122.

The spelling of 216653634 in words is "two hundred sixteen million, six hundred fifty-three thousand, six hundred thirty-four".