78981856 has 12 divisors (see below), whose sum is σ = 155495592. Its totient is φ = 39490912.

The previous prime is 78981823. The next prime is 78981857. The reversal of 78981856 is 65818987.

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 (78981857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1234060 + ... + 1234123.

It is an arithmetic number, because the mean of its divisors is an integer number (12957966).

Almost surely, 2^78981856 is an apocalyptic number.

It is an amenable number.

78981856 is a deficient number, since it is larger than the sum of its proper divisors (76513736).

78981856 is a wasteful number, since it uses less digits than its factorization.

78981856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2468193 (or 2468185 counting only the distinct ones).

The product of its digits is 967680, while the sum is 52.

The square root of 78981856 is about 8887.1736789600. The cubic root of 78981856 is about 429.0511908167.

The spelling of 78981856 in words is "seventy-eight million, nine hundred eighty-one thousand, eight hundred fifty-six".