77964457860 has 72 divisors (see below), whose sum is σ = 250403503896. Its totient is φ = 19567549440.

The previous prime is 77964457853. The next prime is 77964457867. The reversal of 77964457860 is 6875446977.

It is an interprime number because it is at equal distance from previous prime (77964457853) and next prime (77964457867).

It can be written as a sum of positive squares in 4 ways, for example, as 28523156544 + 49441301316 = 168888^2 + 222354^2 .

It is a Smith number, since the sum of its digits (63) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (77964457867) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12736231 + ... + 12742350.

It is an arithmetic number, because the mean of its divisors is an integer number (3477826443).

Almost surely, 2^77964457860 is an apocalyptic number.

It is an amenable number.

77964457860 is an abundant number, since it is smaller than the sum of its proper divisors (172439046036).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

77964457860 is a wasteful number, since it uses less digits than its factorization.

77964457860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25478613 (or 25478608 counting only the distinct ones).

The product of its (nonzero) digits is 71124480, while the sum is 63.

It can be divided in two parts, 77964 and 457860, that added together give a square (535824 = 732²).

The spelling of 77964457860 in words is "seventy-seven billion, nine hundred sixty-four million, four hundred fifty-seven thousand, eight hundred sixty".