216620799 has 16 divisors (see below), whose sum is σ = 296854272. Its totient is φ = 140430528.

The previous prime is 216620779. The next prime is 216620813. The reversal of 216620799 is 997026612.

It is a de Polignac number, because none of the positive numbers 2^k-216620799 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 216620799.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216620779) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26454 + ... + 33660.

It is an arithmetic number, because the mean of its divisors is an integer number (18553392).

Almost surely, 2^216620799 is an apocalyptic number.

216620799 is a deficient number, since it is larger than the sum of its proper divisors (80233473).

216620799 is a wasteful number, since it uses less digits than its factorization.

216620799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7486.

The product of its (nonzero) digits is 81648, while the sum is 42.

The square root of 216620799 is about 14718.0433142453. The cubic root of 216620799 is about 600.5742640815.

The spelling of 216620799 in words is "two hundred sixteen million, six hundred twenty thousand, seven hundred ninety-nine".