78408912 has 60 divisors (see below), whose sum is σ = 206400480. Its totient is φ = 25649280.

The previous prime is 78408907. The next prime is 78408917. The reversal of 78408912 is 21980487.

It is an interprime number because it is at equal distance from previous prime (78408907) and next prime (78408917).

It is a super-2 number, since 2×78408912² = 12295914962047488, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78408917) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 178389 + ... + 178827.

It is an arithmetic number, because the mean of its divisors is an integer number (3440008).

Almost surely, 2^78408912 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 78408912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (103200240).

78408912 is an abundant number, since it is smaller than the sum of its proper divisors (127991568).

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

78408912 is a wasteful number, since it uses less digits than its factorization.

78408912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 572 (or 505 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 39.

The square root of 78408912 is about 8854.8806880725. The cubic root of 78408912 is about 428.0112088368.

The spelling of 78408912 in words is "seventy-eight million, four hundred eight thousand, nine hundred twelve".