78987475 has 24 divisors (see below), whose sum is σ = 112626720. Its totient is φ = 53829120.

The previous prime is 78987449. The next prime is 78987481. The reversal of 78987475 is 57478987.

It is a happy number.

It is not a de Polignac number, because 78987475 - 2¹³ = 78979283 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28971 + ... + 31579.

It is an arithmetic number, because the mean of its divisors is an integer number (4692780).

Almost surely, 2^78987475 is an apocalyptic number.

78987475 is a deficient number, since it is larger than the sum of its proper divisors (33639245).

78987475 is a wasteful number, since it uses less digits than its factorization.

78987475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2799 (or 2794 counting only the distinct ones).

The product of its digits is 3951360, while the sum is 55.

The square root of 78987475 is about 8887.4898030884. The cubic root of 78987475 is about 429.0613652272.

The spelling of 78987475 in words is "seventy-eight million, nine hundred eighty-seven thousand, four hundred seventy-five".