78399554 has 8 divisors (see below), whose sum is σ = 119592720. Its totient is φ = 38535316.

The previous prime is 78399553. The next prime is 78399569. The reversal of 78399554 is 45599387.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×78399554² = 12292980134797832, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78399551) 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, 332084 + ... + 332319.

It is an arithmetic number, because the mean of its divisors is an integer number (14949090).

Almost surely, 2^78399554 is an apocalyptic number.

78399554 is a deficient number, since it is larger than the sum of its proper divisors (41193166).

78399554 is a wasteful number, since it uses less digits than its factorization.

78399554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 664464.

The product of its digits is 1360800, while the sum is 50.

The square root of 78399554 is about 8854.3522631529. The cubic root of 78399554 is about 427.9941806353.

The spelling of 78399554 in words is "seventy-eight million, three hundred ninety-nine thousand, five hundred fifty-four".