816907880 has 16 divisors (see below), whose sum is σ = 1838042820. Its totient is φ = 326763136.

The previous prime is 816907841. The next prime is 816907891. The reversal of 816907880 is 88709618.

It can be written as a sum of positive squares in 2 ways, for example, as 760987396 + 55920484 = 27586^2 + 7478^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10211309 + ... + 10211388.

Almost surely, 2^816907880 is an apocalyptic number.

It is an amenable number.

816907880 is an abundant number, since it is smaller than the sum of its proper divisors (1021134940).

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

816907880 is a wasteful number, since it uses less digits than its factorization.

816907880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20422708 (or 20422704 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 47.

The square root of 816907880 is about 28581.6003750665. The cubic root of 816907880 is about 934.8121788080.

The spelling of 816907880 in words is "eight hundred sixteen million, nine hundred seven thousand, eight hundred eighty".