78099912 has 96 divisors (see below), whose sum is σ = 238268160. Its totient is φ = 22896000.

The previous prime is 78099907. The next prime is 78099913. The reversal of 78099912 is 21999087.

It is not an unprimeable number, because it can be changed into a prime (78099913) 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, 22962 + ... + 26142.

It is an arithmetic number, because the mean of its divisors is an integer number (2481960).

Almost surely, 2^78099912 is an apocalyptic number.

78099912 is a gapful number since it is divisible by the number (72) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78099912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (119134080).

78099912 is an abundant number, since it is smaller than the sum of its proper divisors (160168248).

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

78099912 is a wasteful number, since it uses less digits than its factorization.

78099912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3235 (or 3228 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 45.

The square root of 78099912 is about 8837.4154592845. The cubic root of 78099912 is about 427.4482219017.

The spelling of 78099912 in words is "seventy-eight million, ninety-nine thousand, nine hundred twelve".