78888999 has 8 divisors (see below), whose sum is σ = 120211840. Its totient is φ = 45079416.

The previous prime is 78888991. The next prime is 78889009. The reversal of 78888999 is 99988887.

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

It is not a de Polignac number, because 78888999 - 2³ = 78888991 is a prime.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78888991) 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, 1878289 + ... + 1878330.

It is an arithmetic number, because the mean of its divisors is an integer number (15026480).

Almost surely, 2^78888999 is an apocalyptic number.

78888999 is a deficient number, since it is larger than the sum of its proper divisors (41322841).

78888999 is a wasteful number, since it uses less digits than its factorization.

78888999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3756629.

The product of its digits is 20901888, while the sum is 66.

The square root of 78888999 is about 8881.9479282419. The cubic root of 78888999 is about 428.8829832824.

The spelling of 78888999 in words is "seventy-eight million, eight hundred eighty-eight thousand, nine hundred ninety-nine".