78899688 has 96 divisors (see below), whose sum is σ = 250872960. Its totient is φ = 21928320.

The previous prime is 78899687. The next prime is 78899701. The reversal of 78899688 is 88699887.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (78899687) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16533 + ... + 20763.

It is an arithmetic number, because the mean of its divisors is an integer number (2613260).

Almost surely, 2^78899688 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78899688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (125436480).

78899688 is an abundant number, since it is smaller than the sum of its proper divisors (171973272).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78899688 is a wasteful number, since it uses less digits than its factorization.

78899688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4287 (or 4280 counting only the distinct ones).

The product of its digits is 13934592, while the sum is 63.

The square root of 78899688 is about 8882.5496339733. The cubic root of 78899688 is about 428.9023527899.

The spelling of 78899688 in words is "seventy-eight million, eight hundred ninety-nine thousand, six hundred eighty-eight".