78399227 has 8 divisors (see below), whose sum is σ = 79519440. Its totient is φ = 77283360.

The previous prime is 78399193. The next prime is 78399229. The reversal of 78399227 is 72299387.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78399227 is a prime.

It is a super-2 number, since 2×78399227² = 12292877588395058, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78399229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54149 + ... + 55577.

It is an arithmetic number, because the mean of its divisors is an integer number (9939930).

Almost surely, 2^78399227 is an apocalyptic number.

78399227 is a deficient number, since it is larger than the sum of its proper divisors (1120213).

78399227 is a wasteful number, since it uses less digits than its factorization.

78399227 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2173.

The product of its digits is 381024, while the sum is 47.

The square root of 78399227 is about 8854.3337976383. Note that the first 3 decimals coincide. The cubic root of 78399227 is about 427.9935855882.

The spelling of 78399227 in words is "seventy-eight million, three hundred ninety-nine thousand, two hundred twenty-seven".