77997888 has 84 divisors (see below), whose sum is σ = 235366560. Its totient is φ = 24627456.

The previous prime is 77997877. The next prime is 77997901. The reversal of 77997888 is 88879977.

It is a congruent number.

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, 7381 + ... + 14507.

Almost surely, 2^77997888 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 77997888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (117683280).

77997888 is an abundant number, since it is smaller than the sum of its proper divisors (157368672).

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

77997888 is a wasteful number, since it uses less digits than its factorization.

77997888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7164 (or 7151 counting only the distinct ones).

The product of its digits is 14224896, while the sum is 63.

The square root of 77997888 is about 8831.6412970636. The cubic root of 77997888 is about 427.2620117866.

The spelling of 77997888 in words is "seventy-seven million, nine hundred ninety-seven thousand, eight hundred eighty-eight".