77979957580 has 48 divisors (see below), whose sum is σ = 188408001600. Its totient is φ = 26556542208.

The previous prime is 77979957557. The next prime is 77979957589. The reversal of 77979957580 is 8575997977.

It is not an unprimeable number, because it can be changed into a prime (77979957589) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1848267 + ... + 1889986.

It is an arithmetic number, because the mean of its divisors is an integer number (3925166700).

Almost surely, 2^77979957580 is an apocalyptic number.

77979957580 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

77979957580 is an abundant number, since it is smaller than the sum of its proper divisors (110428044020).

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

77979957580 is a wasteful number, since it uses less digits than its factorization.

77979957580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3738418 (or 3738416 counting only the distinct ones).

The product of its (nonzero) digits is 350065800, while the sum is 73.

The spelling of 77979957580 in words is "seventy-seven billion, nine hundred seventy-nine million, nine hundred fifty-seven thousand, five hundred eighty".