78280684856 has 64 divisors (see below), whose sum is σ = 169600366080. Its totient is φ = 33476820480.

The previous prime is 78280684837. The next prime is 78280684861. The reversal of 78280684856 is 65848608287.

It is a super-2 number, since 2×78280684856² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4939361 + ... + 4955183.

It is an arithmetic number, because the mean of its divisors is an integer number (2650005720).

Almost surely, 2^78280684856 is an apocalyptic number.

It is an amenable number.

78280684856 is an abundant number, since it is smaller than the sum of its proper divisors (91319681224).

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

78280684856 is a wasteful number, since it uses less digits than its factorization.

78280684856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19164 (or 19160 counting only the distinct ones).

The product of its (nonzero) digits is 41287680, while the sum is 62.

The spelling of 78280684856 in words is "seventy-eight billion, two hundred eighty million, six hundred eighty-four thousand, eight hundred fifty-six".