820402899928 has 16 divisors (see below), whose sum is σ = 1541414080080. Its totient is φ = 409359145248.

The previous prime is 820402899871. The next prime is 820402899961. The reversal of 820402899928 is 829998204028.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105283951 + ... + 105291742.

It is an arithmetic number, because the mean of its divisors is an integer number (96338380005).

Almost surely, 2^820402899928 is an apocalyptic number.

It is an amenable number.

820402899928 is a deficient number, since it is larger than the sum of its proper divisors (721011180152).

820402899928 is a wasteful number, since it uses less digits than its factorization.

820402899928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210576186 (or 210576182 counting only the distinct ones).

The product of its (nonzero) digits is 11943936, while the sum is 61.

The spelling of 820402899928 in words is "eight hundred twenty billion, four hundred two million, eight hundred ninety-nine thousand, nine hundred twenty-eight".