216620636 has 6 divisors (see below), whose sum is σ = 379086120. Its totient is φ = 108310316.

The previous prime is 216620629. The next prime is 216620669. The reversal of 216620636 is 636026612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27077576 + ... + 27077583.

It is an arithmetic number, because the mean of its divisors is an integer number (63181020).

Almost surely, 2^216620636 is an apocalyptic number.

It is an amenable number.

216620636 is a deficient number, since it is larger than the sum of its proper divisors (162465484).

216620636 is a wasteful number, since it uses less digits than its factorization.

216620636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54155163 (or 54155161 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 32.

The square root of 216620636 is about 14718.0377768234. The cubic root of 216620636 is about 600.5741134440.

The spelling of 216620636 in words is "two hundred sixteen million, six hundred twenty thousand, six hundred thirty-six".