816687772 has 24 divisors (see below), whose sum is σ = 1505298816. Its totient is φ = 386934768.

The previous prime is 816687761. The next prime is 816687779. The reversal of 816687772 is 277786618.

816687772 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816687779) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31638 + ... + 51325.

It is an arithmetic number, because the mean of its divisors is an integer number (62720784).

Almost surely, 2^816687772 is an apocalyptic number.

It is an amenable number.

816687772 is a deficient number, since it is larger than the sum of its proper divisors (688611044).

816687772 is a wasteful number, since it uses less digits than its factorization.

816687772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83097 (or 83095 counting only the distinct ones).

The product of its digits is 1580544, while the sum is 52.

The square root of 816687772 is about 28577.7495964955. The cubic root of 816687772 is about 934.7282125384.

The spelling of 816687772 in words is "eight hundred sixteen million, six hundred eighty-seven thousand, seven hundred seventy-two".