815998680 has 192 divisors, whose sum is σ = 3049300800. Its totient is φ = 185379840.

The previous prime is 815998661. The next prime is 815998693. The reversal of 815998680 is 86899518.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 455226 + ... + 457014.

It is an arithmetic number, because the mean of its divisors is an integer number (15881775).

Almost surely, 2^815998680 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 815998680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1524650400).

815998680 is an abundant number, since it is smaller than the sum of its proper divisors (2233302120).

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

815998680 is a wasteful number, since it uses less digits than its factorization.

815998680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1994 (or 1987 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 54.

The square root of 815998680 is about 28565.6906095407. The cubic root of 815998680 is about 934.4652417922.

The spelling of 815998680 in words is "eight hundred fifteen million, nine hundred ninety-eight thousand, six hundred eighty".