78638222 has 8 divisors (see below), whose sum is σ = 127031016. Its totient is φ = 36294552.

The previous prime is 78638221. The next prime is 78638239. The reversal of 78638222 is 22283687.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78638221) 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, 1512248 + ... + 1512299.

It is an arithmetic number, because the mean of its divisors is an integer number (15878877).

Almost surely, 2^78638222 is an apocalyptic number.

78638222 is a deficient number, since it is larger than the sum of its proper divisors (48392794).

78638222 is a wasteful number, since it uses less digits than its factorization.

78638222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3024562.

The product of its digits is 64512, while the sum is 38.

The square root of 78638222 is about 8867.8194614009. The cubic root of 78638222 is about 428.4280480473.

The spelling of 78638222 in words is "seventy-eight million, six hundred thirty-eight thousand, two hundred twenty-two".