816977320 has 32 divisors (see below), whose sum is σ = 1841608800. Its totient is φ = 326184768.

The previous prime is 816977303. The next prime is 816977341. The reversal of 816977320 is 23779618.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3211 + ... + 40549.

It is an arithmetic number, because the mean of its divisors is an integer number (57550275).

Almost surely, 2^816977320 is an apocalyptic number.

It is an amenable number.

816977320 is an abundant number, since it is smaller than the sum of its proper divisors (1024631480).

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

816977320 is a wasteful number, since it uses less digits than its factorization.

816977320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37897 (or 37893 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 43.

The square root of 816977320 is about 28582.8151167795. The cubic root of 816977320 is about 934.8386654821.

The spelling of 816977320 in words is "eight hundred sixteen million, nine hundred seventy-seven thousand, three hundred twenty".