77646872 has 8 divisors (see below), whose sum is σ = 145587900. Its totient is φ = 38823432.

The previous prime is 77646869. The next prime is 77646889. The reversal of 77646872 is 27864677.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4852922 + ... + 4852937.

Almost surely, 2^77646872 is an apocalyptic number.

It is an amenable number.

77646872 is a deficient number, since it is larger than the sum of its proper divisors (67941028).

77646872 is a wasteful number, since it uses less digits than its factorization.

77646872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9705865 (or 9705861 counting only the distinct ones).

The product of its digits is 790272, while the sum is 47.

The square root of 77646872 is about 8811.7462514532. The cubic root of 77646872 is about 426.6201083094.

The spelling of 77646872 in words is "seventy-seven million, six hundred forty-six thousand, eight hundred seventy-two".