77998464558280 has 64 divisors (see below), whose sum is σ = 207037399034880. Its totient is φ = 25879674873600.

The previous prime is 77998464558253. The next prime is 77998464558281. The reversal of 77998464558280 is 8285546489977.

It is a super-2 number, since 2×77998464558280² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 77998464558194 and 77998464558203.

It is not an unprimeable number, because it can be changed into a prime (77998464558281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4492990431 + ... + 4493007790.

It is an arithmetic number, because the mean of its divisors is an integer number (3234959359920).

Almost surely, 2^{77998464558280} is an apocalyptic number.

77998464558280 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

77998464558280 is an abundant number, since it is smaller than the sum of its proper divisors (129038934476600).

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

77998464558280 is a wasteful number, since it uses less digits than its factorization.

77998464558280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8985998270 (or 8985998266 counting only the distinct ones).

The product of its (nonzero) digits is 9754214400, while the sum is 82.

The spelling of 77998464558280 in words is "seventy-seven trillion, nine hundred ninety-eight billion, four hundred sixty-four million, five hundred fifty-eight thousand, two hundred eighty".