216779976 has 80 divisors (see below), whose sum is σ = 693939840. Its totient is φ = 61935840.

The previous prime is 216779957. The next prime is 216780013. The reversal of 216779976 is 679977612.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 19360 + ... + 28431.

It is an arithmetic number, because the mean of its divisors is an integer number (8674248).

Almost surely, 2^216779976 is an apocalyptic number.

It is an amenable number.

216779976 is an abundant number, since it is smaller than the sum of its proper divisors (477159864).

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

216779976 is a wasteful number, since it uses less digits than its factorization.

216779976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47816 (or 47803 counting only the distinct ones).

The product of its digits is 2000376, while the sum is 54.

The square root of 216779976 is about 14723.4498674733. The cubic root of 216779976 is about 600.7213324516.

The spelling of 216779976 in words is "two hundred sixteen million, seven hundred seventy-nine thousand, nine hundred seventy-six".