77097940920 has 384 divisors, whose sum is σ = 336428951040. Its totient is φ = 14787947520.

The previous prime is 77097940879. The next prime is 77097940951. The reversal of 77097940920 is 2904979077.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 253387 + ... + 467333.

It is an arithmetic number, because the mean of its divisors is an integer number (876117060).

Almost surely, 2^77097940920 is an apocalyptic number.

77097940920 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 77097940920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (168214475520).

77097940920 is an abundant number, since it is smaller than the sum of its proper divisors (259331010120).

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

77097940920 is a wasteful number, since it uses less digits than its factorization.

77097940920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213995 (or 213988 counting only the distinct ones).

The product of its (nonzero) digits is 2000376, while the sum is 54.

The spelling of 77097940920 in words is "seventy-seven billion, ninety-seven million, nine hundred forty thousand, nine hundred twenty".