78415856 has 20 divisors (see below), whose sum is σ = 152392032. Its totient is φ = 39088896.

The previous prime is 78415823. The next prime is 78415859. The reversal of 78415856 is 65851487.

It is a happy number.

It is a super-2 number, since 2×78415856² = 12298092944425472, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78415859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1880 + ... + 12663.

Almost surely, 2^78415856 is an apocalyptic number.

It is an amenable number.

78415856 is a deficient number, since it is larger than the sum of its proper divisors (73976176).

78415856 is a wasteful number, since it uses less digits than its factorization.

78415856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14888 (or 14882 counting only the distinct ones).

The product of its digits is 268800, while the sum is 44.

The square root of 78415856 is about 8855.2727795365. The cubic root of 78415856 is about 428.0238435490.

The spelling of 78415856 in words is "seventy-eight million, four hundred fifteen thousand, eight hundred fifty-six".