78731222 has 8 divisors (see below), whose sum is σ = 118335000. Its totient is φ = 39286224.

The previous prime is 78731221. The next prime is 78731291. The reversal of 78731222 is 22213787.

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

It is a super-2 number, since 2×78731222² = 12397210635226568, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78731221) 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, 38447 + ... + 40442.

It is an arithmetic number, because the mean of its divisors is an integer number (14791875).

Almost surely, 2^78731222 is an apocalyptic number.

78731222 is a deficient number, since it is larger than the sum of its proper divisors (39603778).

78731222 is a wasteful number, since it uses less digits than its factorization.

78731222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79390.

The product of its digits is 9408, while the sum is 32.

The square root of 78731222 is about 8873.0615911308. The cubic root of 78731222 is about 428.5968722778.

The spelling of 78731222 in words is "seventy-eight million, seven hundred thirty-one thousand, two hundred twenty-two".