78571880172 has 60 divisors (see below), whose sum is σ = 205944695880. Its totient is φ = 26121481344.

The previous prime is 78571880171. The next prime is 78571880203. The reversal of 78571880172 is 27108817587.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (78571880171) 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 19 ways as a sum of consecutive naturals, for example, 197133 + ... + 442724.

It is an arithmetic number, because the mean of its divisors is an integer number (3432411598).

Almost surely, 2^78571880172 is an apocalyptic number.

It is an amenable number.

78571880172 is an abundant number, since it is smaller than the sum of its proper divisors (127372815708).

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

78571880172 is a wasteful number, since it uses less digits than its factorization.

78571880172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 640252 (or 640241 counting only the distinct ones).

The product of its (nonzero) digits is 1756160, while the sum is 54.

The spelling of 78571880172 in words is "seventy-eight billion, five hundred seventy-one million, eight hundred eighty thousand, one hundred seventy-two".