216738408 has 16 divisors (see below), whose sum is σ = 541846080. Its totient is φ = 72246128.

The previous prime is 216738371. The next prime is 216738419. The reversal of 216738408 is 804837612.

216738408 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 4515360 + ... + 4515407.

It is an arithmetic number, because the mean of its divisors is an integer number (33865380).

Almost surely, 2^216738408 is an apocalyptic number.

It is an amenable number.

216738408 is an abundant number, since it is smaller than the sum of its proper divisors (325107672).

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

216738408 is a wasteful number, since it uses less digits than its factorization.

216738408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9030776 (or 9030772 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 39.

The square root of 216738408 is about 14722.0381741116. The cubic root of 216738408 is about 600.6829334859.

The spelling of 216738408 in words is "two hundred sixteen million, seven hundred thirty-eight thousand, four hundred eight".