77668816 has 40 divisors (see below), whose sum is σ = 154811520. Its totient is φ = 37730304.

The previous prime is 77668781. The next prime is 77668831. The reversal of 77668816 is 61886677.

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 77668816.

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, 134320 + ... + 134896.

It is an arithmetic number, because the mean of its divisors is an integer number (3870288).

Almost surely, 2^77668816 is an apocalyptic number.

It is an amenable number.

77668816 is a deficient number, since it is larger than the sum of its proper divisors (77142704).

77668816 is a wasteful number, since it uses less digits than its factorization.

77668816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 811 (or 805 counting only the distinct ones).

The product of its digits is 677376, while the sum is 49.

The square root of 77668816 is about 8812.9913196372. The cubic root of 77668816 is about 426.6602939586.

The spelling of 77668816 in words is "seventy-seven million, six hundred sixty-eight thousand, eight hundred sixteen".