77021580720 has 160 divisors (see below), whose sum is σ = 281679114240. Its totient is φ = 17037020160.

The previous prime is 77021580709. The next prime is 77021580721. The reversal of 77021580720 is 2708512077.

It is not an unprimeable number, because it can be changed into a prime (77021580721) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 687375 + ... + 791534.

It is an arithmetic number, because the mean of its divisors is an integer number (1760494464).

Almost surely, 2^77021580720 is an apocalyptic number.

77021580720 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

77021580720 is an abundant number, since it is smaller than the sum of its proper divisors (204657533520).

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

77021580720 is a wasteful number, since it uses less digits than its factorization.

77021580720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1478963 (or 1478957 counting only the distinct ones).

The product of its (nonzero) digits is 54880, while the sum is 39.

The spelling of 77021580720 in words is "seventy-seven billion, twenty-one million, five hundred eighty thousand, seven hundred twenty".