78615816 has 32 divisors (see below), whose sum is σ = 196756800. Its totient is φ = 26176320.

The previous prime is 78615811. The next prime is 78615821. The reversal of 78615816 is 61851687.

It is an interprime number because it is at equal distance from previous prime (78615811) and next prime (78615821).

It is not an unprimeable number, because it can be changed into a prime (78615811) 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, 42021 + ... + 43851.

It is an arithmetic number, because the mean of its divisors is an integer number (6148650).

Almost surely, 2^78615816 is an apocalyptic number.

It is an amenable number.

78615816 is an abundant number, since it is smaller than the sum of its proper divisors (118140984).

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

78615816 is a wasteful number, since it uses less digits than its factorization.

78615816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3629 (or 3625 counting only the distinct ones).

The product of its digits is 80640, while the sum is 42.

The square root of 78615816 is about 8866.5560394101. The cubic root of 78615816 is about 428.3873542200.

The spelling of 78615816 in words is "seventy-eight million, six hundred fifteen thousand, eight hundred sixteen".