77997009888 has 360 divisors, whose sum is σ = 271896127272. Its totient is φ = 21862503936.

The previous prime is 77997009863. The next prime is 77997009911. The reversal of 77997009888 is 88890079977.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 6725631 + ... + 6737217.

Almost surely, 2^77997009888 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 77997009888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (135948063636).

77997009888 is an abundant number, since it is smaller than the sum of its proper divisors (193899117384).

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

77997009888 is a wasteful number, since it uses less digits than its factorization.

77997009888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11676 (or 11652 counting only the distinct ones).

The product of its (nonzero) digits is 128024064, while the sum is 72.

The spelling of 77997009888 in words is "seventy-seven billion, nine hundred ninety-seven million, nine thousand, eight hundred eighty-eight".