77840172780 has 48 divisors (see below), whose sum is σ = 220110446304. Its totient is φ = 20551859200.

The previous prime is 77840172763. The next prime is 77840172847. The reversal of 77840172780 is 8727104877.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6416397 + ... + 6428516.

It is an arithmetic number, because the mean of its divisors is an integer number (4585634298).

Almost surely, 2^77840172780 is an apocalyptic number.

It is an amenable number.

77840172780 is an abundant number, since it is smaller than the sum of its proper divisors (142270273524).

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

77840172780 is a wasteful number, since it uses less digits than its factorization.

77840172780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12845026 (or 12845024 counting only the distinct ones).

The product of its (nonzero) digits is 1229312, while the sum is 51.

The spelling of 77840172780 in words is "seventy-seven billion, eight hundred forty million, one hundred seventy-two thousand, seven hundred eighty".