816775408 has 20 divisors (see below), whose sum is σ = 1583356000. Its totient is φ = 408167424.

The previous prime is 816775381. The next prime is 816775417. The reversal of 816775408 is 804577618.

It is a super-2 number, since 2×816775408² = 1334244134227132928, 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 3 ways as a sum of consecutive naturals, for example, 19216 + ... + 44752.

It is an arithmetic number, because the mean of its divisors is an integer number (79167800).

Almost surely, 2^816775408 is an apocalyptic number.

It is an amenable number.

816775408 is a deficient number, since it is larger than the sum of its proper divisors (766580592).

816775408 is a wasteful number, since it uses less digits than its factorization.

816775408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27544 (or 27538 counting only the distinct ones).

The product of its (nonzero) digits is 376320, while the sum is 46.

The square root of 816775408 is about 28579.2828461457. The cubic root of 816775408 is about 934.7616455159.

The spelling of 816775408 in words is "eight hundred sixteen million, seven hundred seventy-five thousand, four hundred eight".