77987243796 has 108 divisors (see below), whose sum is σ = 232672898304. Its totient is φ = 20256408480.

The previous prime is 77987243783. The next prime is 77987243797. The reversal of 77987243796 is 69734278977.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 77987243796.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77987243797) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 476916 + ... + 619211.

It is an arithmetic number, because the mean of its divisors is an integer number (2154378688).

Almost surely, 2^77987243796 is an apocalyptic number.

It is an amenable number.

77987243796 is an abundant number, since it is smaller than the sum of its proper divisors (154685654508).

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

77987243796 is a wasteful number, since it uses less digits than its factorization.

77987243796 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1096170 (or 1096150 counting only the distinct ones).

The product of its digits is 224042112, while the sum is 69.

The spelling of 77987243796 in words is "seventy-seven billion, nine hundred eighty-seven million, two hundred forty-three thousand, seven hundred ninety-six".