816169768 has 16 divisors (see below), whose sum is σ = 1530720180. Its totient is φ = 407977728.

The previous prime is 816169751. The next prime is 816169771. The reversal of 816169768 is 867961618.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 815787844 + 381924 = 28562^2 + 618^2 .

It is a super-2 number, since 2×816169768² = 1332266180394347648, which contains 22 as substring.

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, 25680 + ... + 47872.

Almost surely, 2^816169768 is an apocalyptic number.

It is an amenable number.

816169768 is a deficient number, since it is larger than the sum of its proper divisors (714550412).

816169768 is a wasteful number, since it uses less digits than its factorization.

816169768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26796 (or 26792 counting only the distinct ones).

The product of its digits is 870912, while the sum is 52.

The square root of 816169768 is about 28568.6850939976. The cubic root of 816169768 is about 934.5305460715.

The spelling of 816169768 in words is "eight hundred sixteen million, one hundred sixty-nine thousand, seven hundred sixty-eight".