78999408 has 160 divisors (see below), whose sum is σ = 248555520. Its totient is φ = 23915520.

The previous prime is 78999343. The next prime is 78999409. The reversal of 78999408 is 80499987.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78999409) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 227491 + ... + 227837.

It is an arithmetic number, because the mean of its divisors is an integer number (1553472).

Almost surely, 2^78999408 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 78999408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (124277760).

78999408 is an abundant number, since it is smaller than the sum of its proper divisors (169556112).

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

78999408 is a wasteful number, since it uses less digits than its factorization.

78999408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 412 (or 400 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 54.

The square root of 78999408 is about 8888.1611146513. The cubic root of 78999408 is about 429.0829708951.

The spelling of 78999408 in words is "seventy-eight million, nine hundred ninety-nine thousand, four hundred eight".