815989890628 has 48 divisors (see below), whose sum is σ = 1573792311168. Its totient is φ = 367099200000.

The previous prime is 815989890607. The next prime is 815989890671. The reversal of 815989890628 is 826098989518.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12798028 + ... + 12861628.

It is an arithmetic number, because the mean of its divisors is an integer number (32787339816).

Almost surely, 2^815989890628 is an apocalyptic number.

It is an amenable number.

815989890628 is a deficient number, since it is larger than the sum of its proper divisors (757802420540).

815989890628 is a wasteful number, since it uses less digits than its factorization.

815989890628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66604 (or 66602 counting only the distinct ones).

The product of its (nonzero) digits is 179159040, while the sum is 73.

The spelling of 815989890628 in words is "eight hundred fifteen billion, nine hundred eighty-nine million, eight hundred ninety thousand, six hundred twenty-eight".