77644768 has 12 divisors (see below), whose sum is σ = 152863200. Its totient is φ = 38822368.

The previous prime is 77644751. The next prime is 77644769. The reversal of 77644768 is 86744677.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77644769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1213168 + ... + 1213231.

It is an arithmetic number, because the mean of its divisors is an integer number (12738600).

Almost surely, 2^77644768 is an apocalyptic number.

It is an amenable number.

77644768 is a deficient number, since it is larger than the sum of its proper divisors (75218432).

77644768 is a wasteful number, since it uses less digits than its factorization.

77644768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2426409 (or 2426401 counting only the distinct ones).

The product of its digits is 1580544, while the sum is 49.

The square root of 77644768 is about 8811.6268645466. The cubic root of 77644768 is about 426.6162548946.

Subtracting 77644768 from its reverse (86744677), we obtain a palindrome (9099909).

The spelling of 77644768 in words is "seventy-seven million, six hundred forty-four thousand, seven hundred sixty-eight".