78807256570 has 32 divisors (see below), whose sum is σ = 164537463168. Its totient is φ = 26616351168.

The previous prime is 78807256547. The next prime is 78807256573. The reversal of 78807256570 is 7565270887.

It is a happy number.

It is a Smith number, since the sum of its digits (55) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (78807256573) 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, 8396937 + ... + 8406316.

It is an arithmetic number, because the mean of its divisors is an integer number (5141795724).

Almost surely, 2^78807256570 is an apocalyptic number.

78807256570 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

78807256570 is an abundant number, since it is smaller than the sum of its proper divisors (85730206598).

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

78807256570 is a wasteful number, since it uses less digits than its factorization.

78807256570 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16803334.

The product of its (nonzero) digits is 6585600, while the sum is 55.

The spelling of 78807256570 in words is "seventy-eight billion, eight hundred seven million, two hundred fifty-six thousand, five hundred seventy".