77643064 has 8 divisors (see below), whose sum is σ = 145580760. Its totient is φ = 38821528.

The previous prime is 77643047. The next prime is 77643103. The reversal of 77643064 is 46034677.

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

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

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, 4852684 + ... + 4852699.

It is an arithmetic number, because the mean of its divisors is an integer number (18197595).

Almost surely, 2^77643064 is an apocalyptic number.

It is an amenable number.

77643064 is a deficient number, since it is larger than the sum of its proper divisors (67937696).

77643064 is a wasteful number, since it uses less digits than its factorization.

77643064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9705389 (or 9705385 counting only the distinct ones).

The product of its (nonzero) digits is 84672, while the sum is 37.

The square root of 77643064 is about 8811.5301735851. The cubic root of 77643064 is about 426.6131340172.

The spelling of 77643064 in words is "seventy-seven million, six hundred forty-three thousand, sixty-four".