78280857856812 has 36 divisors (see below), whose sum is σ = 197786546187720. Its totient is φ = 24086417801472.

The previous prime is 78280857856781. The next prime is 78280857856819. The reversal of 78280857856812 is 21865875808287.

It is a super-2 number, since 2×78280857856812² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78280857856819) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19300012237 + ... + 19300016292.

Almost surely, 2^{78280857856812} is an apocalyptic number.

It is an amenable number.

78280857856812 is an abundant number, since it is smaller than the sum of its proper divisors (119505688330908).

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

78280857856812 is a wasteful number, since it uses less digits than its factorization.

78280857856812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38600028562 (or 38600028547 counting only the distinct ones).

The product of its (nonzero) digits is 963379200, while the sum is 75.

The spelling of 78280857856812 in words is "seventy-eight trillion, two hundred eighty billion, eight hundred fifty-seven million, eight hundred fifty-six thousand, eight hundred twelve".