77099939520 has 224 divisors, whose sum is σ = 264085230528. Its totient is φ = 18985254912.

The previous prime is 77099939461. The next prime is 77099939531. The reversal of 77099939520 is 2593999077.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 820392 + ... + 909528.

It is an arithmetic number, because the mean of its divisors is an integer number (1178951922).

Almost surely, 2^77099939520 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 77099939520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (132042615264).

77099939520 is an abundant number, since it is smaller than the sum of its proper divisors (186985291008).

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

77099939520 is a wasteful number, since it uses less digits than its factorization.

77099939520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89227 (or 89217 counting only the distinct ones).

The product of its (nonzero) digits is 9644670, while the sum is 60.

The spelling of 77099939520 in words is "seventy-seven billion, ninety-nine million, nine hundred thirty-nine thousand, five hundred twenty".