77196464578 has 4 divisors (see below), whose sum is σ = 115794696870. Its totient is φ = 38598232288.

The previous prime is 77196464573. The next prime is 77196464591. The reversal of 77196464578 is 87546469177.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 43935094449 + 33261370129 = 209607^2 + 182377^2 .

It is not an unprimeable number, because it can be changed into a prime (77196464573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19299116143 + ... + 19299116146.

Almost surely, 2^77196464578 is an apocalyptic number.

77196464578 is a deficient number, since it is larger than the sum of its proper divisors (38598232292).

77196464578 is a wasteful number, since it uses less digits than its factorization.

77196464578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38598232291.

The product of its digits is 71124480, while the sum is 64.

The spelling of 77196464578 in words is "seventy-seven billion, one hundred ninety-six million, four hundred sixty-four thousand, five hundred seventy-eight".