78239222 has 8 divisors (see below), whose sum is σ = 117915672. Its totient is φ = 38934000.

The previous prime is 78239221. The next prime is 78239233. The reversal of 78239222 is 22293287.

It is a happy number.

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

It is a super-2 number, since 2×78239222² = 12242751718330568, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78239221) 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, 92279 + ... + 93122.

It is an arithmetic number, because the mean of its divisors is an integer number (14739459).

Almost surely, 2^78239222 is an apocalyptic number.

78239222 is a deficient number, since it is larger than the sum of its proper divisors (39676450).

78239222 is a wasteful number, since it uses less digits than its factorization.

78239222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185614.

The product of its digits is 24192, while the sum is 35.

The square root of 78239222 is about 8845.2937769189. The cubic root of 78239222 is about 427.7022232160.

It can be divided in two parts, 782 and 39222, that added together give a palindrome (40004).

The spelling of 78239222 in words is "seventy-eight million, two hundred thirty-nine thousand, two hundred twenty-two".