77644612 has 6 divisors (see below), whose sum is σ = 135878078. Its totient is φ = 38822304.

The previous prime is 77644603. The next prime is 77644631. The reversal of 77644612 is 21644677.

It can be written as a sum of positive squares in only one way, i.e., 66977856 + 10666756 = 8184^2 + 3266^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9705573 + ... + 9705580.

Almost surely, 2^77644612 is an apocalyptic number.

It is an amenable number.

77644612 is a deficient number, since it is larger than the sum of its proper divisors (58233466).

77644612 is a wasteful number, since it uses less digits than its factorization.

77644612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19411157 (or 19411155 counting only the distinct ones).

The product of its digits is 56448, while the sum is 37.

The square root of 77644612 is about 8811.6180126013. The cubic root of 77644612 is about 426.6159691824.

The spelling of 77644612 in words is "seventy-seven million, six hundred forty-four thousand, six hundred twelve".