78671856 has 40 divisors (see below), whose sum is σ = 213934720. Its totient is φ = 24843456.

The previous prime is 78671821. The next prime is 78671861. The reversal of 78671856 is 65817687.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42220 + ... + 44043.

It is an arithmetic number, because the mean of its divisors is an integer number (5348368).

Almost surely, 2^78671856 is an apocalyptic number.

78671856 is a gapful number since it is divisible by the number (76) formed by its first and last digit.

It is an amenable number.

78671856 is an abundant number, since it is smaller than the sum of its proper divisors (135262864).

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

78671856 is a wasteful number, since it uses less digits than its factorization.

78671856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86293 (or 86287 counting only the distinct ones).

The product of its digits is 564480, while the sum is 48.

The square root of 78671856 is about 8869.7156662432. The cubic root of 78671856 is about 428.4891196853.

The spelling of 78671856 in words is "seventy-eight million, six hundred seventy-one thousand, eight hundred fifty-six".