77131733720 has 96 divisors (see below), whose sum is σ = 181734159600. Its totient is φ = 29460178176.

The previous prime is 77131733713. The next prime is 77131733741. The reversal of 77131733720 is 2733713177.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13603046 + ... + 13608714.

Almost surely, 2^77131733720 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 77131733720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90867079800).

77131733720 is an abundant number, since it is smaller than the sum of its proper divisors (104602425880).

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

77131733720 is a wasteful number, since it uses less digits than its factorization.

77131733720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6369 (or 6342 counting only the distinct ones).

The product of its (nonzero) digits is 129654, while the sum is 41.

The spelling of 77131733720 in words is "seventy-seven billion, one hundred thirty-one million, seven hundred thirty-three thousand, seven hundred twenty".