816949980 has 144 divisors (see below), whose sum is σ = 3089608704. Its totient is φ = 169752960.

The previous prime is 816949951. The next prime is 816949999. The reversal of 816949980 is 89949618.

816949980 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 15612 + ... + 43331.

It is an arithmetic number, because the mean of its divisors is an integer number (21455616).

Almost surely, 2^816949980 is an apocalyptic number.

It is an amenable number.

816949980 is an abundant number, since it is smaller than the sum of its proper divisors (2272658724).

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

816949980 is a wasteful number, since it uses less digits than its factorization.

816949980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58976 (or 58971 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 54.

The square root of 816949980 is about 28582.3368533785. The cubic root of 816949980 is about 934.8282372962.

The spelling of 816949980 in words is "eight hundred sixteen million, nine hundred forty-nine thousand, nine hundred eighty".