78670816 has 48 divisors (see below), whose sum is σ = 178216416. Its totient is φ = 33486336.

The previous prime is 78670771. The next prime is 78670817. The reversal of 78670816 is 61807687.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78670817) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34050 + ... + 36286.

It is an arithmetic number, because the mean of its divisors is an integer number (3712842).

Almost surely, 2^78670816 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78670816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89108208).

78670816 is an abundant number, since it is smaller than the sum of its proper divisors (99545600).

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

78670816 is a wasteful number, since it uses less digits than its factorization.

78670816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2411 (or 2403 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 43.

The square root of 78670816 is about 8869.6570395929. The cubic root of 78670816 is about 428.4872315444.

The spelling of 78670816 in words is "seventy-eight million, six hundred seventy thousand, eight hundred sixteen".