816557912 has 32 divisors (see below), whose sum is σ = 1552219200. Its totient is φ = 402657024.

The previous prime is 816557897. The next prime is 816557933. The reversal of 816557912 is 219755618.

It is a super-3 number, since 3×816557912³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 328418 + ... + 330894.

It is an arithmetic number, because the mean of its divisors is an integer number (48506850).

Almost surely, 2^816557912 is an apocalyptic number.

It is an amenable number.

816557912 is a deficient number, since it is larger than the sum of its proper divisors (735661288).

816557912 is a wasteful number, since it uses less digits than its factorization.

816557912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3035 (or 3031 counting only the distinct ones).

The product of its digits is 151200, while the sum is 44.

The square root of 816557912 is about 28575.4774588282. The cubic root of 816557912 is about 934.6786667821.

The spelling of 816557912 in words is "eight hundred sixteen million, five hundred fifty-seven thousand, nine hundred twelve".