78945915 has 8 divisors (see below), whose sum is σ = 126313488. Its totient is φ = 42104480.

The previous prime is 78945907. The next prime is 78945929. The reversal of 78945915 is 51954987.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 78945915 - 2³ = 78945907 is a prime.

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, 2631516 + ... + 2631545.

It is an arithmetic number, because the mean of its divisors is an integer number (15789186).

Almost surely, 2^78945915 is an apocalyptic number.

78945915 is a deficient number, since it is larger than the sum of its proper divisors (47367573).

78945915 is a wasteful number, since it uses less digits than its factorization.

78945915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5263069.

The product of its digits is 453600, while the sum is 48.

The square root of 78945915 is about 8885.1513774387. The cubic root of 78945915 is about 428.9861004728.

The spelling of 78945915 in words is "seventy-eight million, nine hundred forty-five thousand, nine hundred fifteen".