78375634660872 has 40 divisors (see below), whose sum is σ = 219524347084350. Its totient is φ = 26125211553408.

The previous prime is 78375634660871. The next prime is 78375634660877. The reversal of 78375634660872 is 27806643657387.

It is a happy number.

78375634660872 is a `hidden beast` number, since 7 + 8 + 3 + 7 + 5 + 6 + 3 + 4 + 6 + 608 + 7 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 59819303678436 + 18556330982436 = 7734294^2 + 4307706^2 .

It is a super-2 number, since 2×78375634660872² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a self number, because there is not a number n which added to its sum of digits gives 78375634660872.

It is not an unprimeable number, because it can be changed into a prime (78375634660871) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 60475026097 + ... + 60475027392.

Almost surely, 2^{78375634660872} is an apocalyptic number.

78375634660872 is a gapful number since it is divisible by the number (72) formed by its first and last digit.

It is an amenable number.

78375634660872 is an abundant number, since it is smaller than the sum of its proper divisors (141148712423478).

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

78375634660872 is a wasteful number, since it uses less digits than its factorization.

78375634660872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120950053507 (or 120950053494 counting only the distinct ones).

The product of its (nonzero) digits is 1706987520, while the sum is 72.

The spelling of 78375634660872 in words is "seventy-eight trillion, three hundred seventy-five billion, six hundred thirty-four million, six hundred sixty thousand, eight hundred seventy-two".