78572157872 has 20 divisors (see below), whose sum is σ = 163943829840. Its totient is φ = 36264072768.

The previous prime is 78572157809. The next prime is 78572157887. The reversal of 78572157872 is 27875127587.

It is a happy number.

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 3 ways as a sum of consecutive naturals, for example, 188875172 + ... + 188875587.

It is an arithmetic number, because the mean of its divisors is an integer number (8197191492).

Almost surely, 2^78572157872 is an apocalyptic number.

It is an amenable number.

78572157872 is an abundant number, since it is smaller than the sum of its proper divisors (85371671968).

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

78572157872 is a wasteful number, since it uses less digits than its factorization.

78572157872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 377750780 (or 377750774 counting only the distinct ones).

The product of its digits is 15366400, while the sum is 59.

The spelling of 78572157872 in words is "seventy-eight billion, five hundred seventy-two million, one hundred fifty-seven thousand, eight hundred seventy-two".