78397227 has 20 divisors (see below), whose sum is σ = 118049536. Its totient is φ = 51846480.

The previous prime is 78397223. The next prime is 78397247. The reversal of 78397227 is 72279387.

It is not a de Polignac number, because 78397227 - 2² = 78397223 is a prime.

It is a super-2 number, since 2×78397227² = 12292250402579058, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78397223) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 6477 + ... + 14097.

Almost surely, 2^78397227 is an apocalyptic number.

78397227 is a deficient number, since it is larger than the sum of its proper divisors (39652309).

78397227 is a wasteful number, since it uses less digits than its factorization.

78397227 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7760 (or 7751 counting only the distinct ones).

The product of its digits is 296352, while the sum is 45.

The square root of 78397227 is about 8854.2208578734. The cubic root of 78397227 is about 427.9899461201.

The spelling of 78397227 in words is "seventy-eight million, three hundred ninety-seven thousand, two hundred twenty-seven".