77240864 has 12 divisors (see below), whose sum is σ = 152068014. Its totient is φ = 38620416.

The previous prime is 77240851. The next prime is 77240869. The reversal of 77240864 is 46804277.

It can be written as a sum of positive squares in only one way, i.e., 75550864 + 1690000 = 8692^2 + 1300^2 .

It is not an unprimeable number, because it can be changed into a prime (77240869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1206857 + ... + 1206920.

Almost surely, 2^77240864 is an apocalyptic number.

It is an amenable number.

77240864 is a deficient number, since it is larger than the sum of its proper divisors (74827150).

77240864 is a wasteful number, since it uses less digits than its factorization.

77240864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2413787 (or 2413779 counting only the distinct ones).

The product of its (nonzero) digits is 75264, while the sum is 38.

The square root of 77240864 is about 8788.6781713748. The cubic root of 77240864 is about 425.8752233619.

The spelling of 77240864 in words is "seventy-seven million, two hundred forty thousand, eight hundred sixty-four".