78490915 has 8 divisors (see below), whose sum is σ = 97227648. Its totient is φ = 60767040.

The previous prime is 78490913. The next prime is 78490931. The reversal of 78490915 is 51909487.

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

It is not a de Polignac number, because 78490915 - 2¹ = 78490913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78490913) 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, 253042 + ... + 253351.

It is an arithmetic number, because the mean of its divisors is an integer number (12153456).

Almost surely, 2^78490915 is an apocalyptic number.

78490915 is a deficient number, since it is larger than the sum of its proper divisors (18736733).

78490915 is a wasteful number, since it uses less digits than its factorization.

78490915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 506429.

The product of its (nonzero) digits is 90720, while the sum is 43.

The square root of 78490915 is about 8859.5098622892. The cubic root of 78490915 is about 428.1603669435.

The spelling of 78490915 in words is "seventy-eight million, four hundred ninety thousand, nine hundred fifteen".