78223258 has 4 divisors (see below), whose sum is σ = 117334890. Its totient is φ = 39111628.

The previous prime is 78223241. The next prime is 78223279. The reversal of 78223258 is 85232287.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 69772609 + 8450649 = 8353^2 + 2907^2 .

It is a super-2 number, since 2×78223258² = 12237756184269128, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19555813 + ... + 19555816.

Almost surely, 2^78223258 is an apocalyptic number.

78223258 is a deficient number, since it is larger than the sum of its proper divisors (39111632).

78223258 is a wasteful number, since it uses less digits than its factorization.

78223258 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39111631.

The product of its digits is 53760, while the sum is 37.

The square root of 78223258 is about 8844.3913301029. The cubic root of 78223258 is about 427.6731316575.

The spelling of 78223258 in words is "seventy-eight million, two hundred twenty-three thousand, two hundred fifty-eight".