816677776 has 20 divisors (see below), whose sum is σ = 1583185500. Its totient is φ = 408113792.

The previous prime is 816677731. The next prime is 816677783. The reversal of 816677776 is 677776618.

It can be written as a sum of positive squares in 2 ways, for example, as 664402176 + 152275600 = 25776^2 + 12340^2 .

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, 18090 + ... + 44278.

It is an arithmetic number, because the mean of its divisors is an integer number (79159275).

Almost surely, 2^816677776 is an apocalyptic number.

It is an amenable number.

816677776 is a deficient number, since it is larger than the sum of its proper divisors (766507724).

816677776 is a wasteful number, since it uses less digits than its factorization.

816677776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28146 (or 28140 counting only the distinct ones).

The product of its digits is 4148928, while the sum is 55.

The square root of 816677776 is about 28577.5747046526. The cubic root of 816677776 is about 934.7243989303.

The spelling of 816677776 in words is "eight hundred sixteen million, six hundred seventy-seven thousand, seven hundred seventy-six".