77643237996 has 36 divisors (see below), whose sum is σ = 196857826984. Its totient is φ = 25802884800.

The previous prime is 77643237977. The next prime is 77643238021. The reversal of 77643237996 is 69973234677.

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3246025 + ... + 3269856.

Almost surely, 2^77643237996 is an apocalyptic number.

It is an amenable number.

77643237996 is an abundant number, since it is smaller than the sum of its proper divisors (119214588988).

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

77643237996 is a wasteful number, since it uses less digits than its factorization.

77643237996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6516222 (or 6516217 counting only the distinct ones).

The product of its digits is 72013536, while the sum is 63.

The spelling of 77643237996 in words is "seventy-seven billion, six hundred forty-three million, two hundred thirty-seven thousand, nine hundred ninety-six".