816420920 has 64 divisors (see below), whose sum is σ = 2222873280. Its totient is φ = 263448576.

The previous prime is 816420907. The next prime is 816420931. The reversal of 816420920 is 29024618.

It is a super-2 number, since 2×816420920² = 1333086237227292800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80999 + ... + 90518.

It is an arithmetic number, because the mean of its divisors is an integer number (34732395).

Almost surely, 2^816420920 is an apocalyptic number.

It is an amenable number.

816420920 is an abundant number, since it is smaller than the sum of its proper divisors (1406452360).

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

816420920 is a wasteful number, since it uses less digits than its factorization.

816420920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171552 (or 171548 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 816420920 is about 28573.0803379685. The cubic root of 816420920 is about 934.6263942451.

The spelling of 816420920 in words is "eight hundred sixteen million, four hundred twenty thousand, nine hundred twenty".