78785856 has 168 divisors, whose sum is σ = 248838720. Its totient is φ = 23721984.

The previous prime is 78785851. The next prime is 78785867. The reversal of 78785856 is 65858787.

It is a happy number.

It is a super-2 number, since 2×78785856² = 12414422211305472, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78785851) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 251556 + ... + 251868.

Almost surely, 2^78785856 is an apocalyptic number.

78785856 is a gapful number since it is divisible by the number (76) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78785856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (124419360).

78785856 is an abundant number, since it is smaller than the sum of its proper divisors (170052864).

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

78785856 is a wasteful number, since it uses less digits than its factorization.

78785856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 373 (or 360 counting only the distinct ones).

The product of its digits is 3763200, while the sum is 54.

The square root of 78785856 is about 8876.1397014693. The cubic root of 78785856 is about 428.6959881756.

The spelling of 78785856 in words is "seventy-eight million, seven hundred eighty-five thousand, eight hundred fifty-six".