78966915 has 16 divisors (see below), whose sum is σ = 127006368. Its totient is φ = 41895936.

The previous prime is 78966911. The next prime is 78966929. The reversal of 78966915 is 51966987.

It is not a de Polignac number, because 78966915 - 2² = 78966911 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78966911) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10744 + ... + 16533.

It is an arithmetic number, because the mean of its divisors is an integer number (7937898).

Almost surely, 2^78966915 is an apocalyptic number.

78966915 is a deficient number, since it is larger than the sum of its proper divisors (48039453).

78966915 is a wasteful number, since it uses less digits than its factorization.

78966915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27478.

The product of its digits is 816480, while the sum is 51.

The square root of 78966915 is about 8886.3330457506. Note that the first 3 decimals coincide. The cubic root of 78966915 is about 429.0241345685.

The spelling of 78966915 in words is "seventy-eight million, nine hundred sixty-six thousand, nine hundred fifteen".