78205714372172 has 48 divisors (see below), whose sum is σ = 143660907936000. Its totient is φ = 37180166950080.

The previous prime is 78205714372171. The next prime is 78205714372183. The reversal of 78205714372172 is 27127341750287.

It is a super-2 number, since 2×78205714372172² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78205714372171) 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, 37945079 + ... + 39952977.

It is an arithmetic number, because the mean of its divisors is an integer number (2992935582000).

Almost surely, 2^{78205714372172} is an apocalyptic number.

It is an amenable number.

78205714372172 is a deficient number, since it is larger than the sum of its proper divisors (65455193563828).

78205714372172 is a wasteful number, since it uses less digits than its factorization.

78205714372172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2010446 (or 2010444 counting only the distinct ones).

The product of its (nonzero) digits is 9219840, while the sum is 56.

The spelling of 78205714372172 in words is "seventy-eight trillion, two hundred five billion, seven hundred fourteen million, three hundred seventy-two thousand, one hundred seventy-two".