77644966 has 8 divisors (see below), whose sum is σ = 133105680. Its totient is φ = 33276408.

The previous prime is 77644937. The next prime is 77644991. The reversal of 77644966 is 66944677.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

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, 2773021 + ... + 2773048.

It is an arithmetic number, because the mean of its divisors is an integer number (16638210).

Almost surely, 2^77644966 is an apocalyptic number.

77644966 is a deficient number, since it is larger than the sum of its proper divisors (55460714).

77644966 is a wasteful number, since it uses less digits than its factorization.

77644966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5546078.

The product of its digits is 1524096, while the sum is 49.

The square root of 77644966 is about 8811.6380996952. The cubic root of 77644966 is about 426.6166175289.

The spelling of 77644966 in words is "seventy-seven million, six hundred forty-four thousand, nine hundred sixty-six".