77145664 has 28 divisors (see below), whose sum is σ = 153911808. Its totient is φ = 38364800.

The previous prime is 77145647. The next prime is 77145667. The reversal of 77145664 is 46654177.

It is not an unprimeable number, because it can be changed into a prime (77145667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9069 + ... + 15379.

Almost surely, 2^77145664 is an apocalyptic number.

It is an amenable number.

77145664 is a deficient number, since it is larger than the sum of its proper divisors (76766144).

77145664 is a wasteful number, since it uses less digits than its factorization.

77145664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6514 (or 6504 counting only the distinct ones).

The product of its digits is 141120, while the sum is 40.

The square root of 77145664 is about 8783.2604424553. The cubic root of 77145664 is about 425.7001865259.

The spelling of 77145664 in words is "seventy-seven million, one hundred forty-five thousand, six hundred sixty-four".