78312266 has 8 divisors (see below), whose sum is σ = 117526980. Its totient is φ = 39136608.

The previous prime is 78312253. The next prime is 78312307. The reversal of 78312266 is 66221387.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 54096025 + 24216241 = 7355^2 + 4921^2 .

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

It is a super-2 number, since 2×78312266² = 12265622012109512, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4091 + ... + 13166.

Almost surely, 2^78312266 is an apocalyptic number.

78312266 is a deficient number, since it is larger than the sum of its proper divisors (39214714).

78312266 is a wasteful number, since it uses less digits than its factorization.

78312266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19528.

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

The square root of 78312266 is about 8849.4217890210. The cubic root of 78312266 is about 427.8352824977.

The spelling of 78312266 in words is "seventy-eight million, three hundred twelve thousand, two hundred sixty-six".