78399408 has 20 divisors (see below), whose sum is σ = 202531928. Its totient is φ = 26133120.

The previous prime is 78399401. The next prime is 78399437. The reversal of 78399408 is 80499387.

It is a super-2 number, since 2×78399408² = 12292934349500928, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48), and also a Moran number because the ratio is a prime number: 1633321 = 78399408 / (7 + 8 + 3 + 9 + 9 + 4 + 0 + 8).

It is not an unprimeable number, because it can be changed into a prime (78399401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 816613 + ... + 816708.

Almost surely, 2^78399408 is an apocalyptic number.

It is an amenable number.

78399408 is an abundant number, since it is smaller than the sum of its proper divisors (124132520).

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

78399408 is a wasteful number, since it uses less digits than its factorization.

78399408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1633332 (or 1633326 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 48.

The square root of 78399408 is about 8854.3440186159. The cubic root of 78399408 is about 427.9939149570.

The spelling of 78399408 in words is "seventy-eight million, three hundred ninety-nine thousand, four hundred eight".