78238456 has 64 divisors (see below), whose sum is σ = 159667200. Its totient is φ = 35849088.

The previous prime is 78238411. The next prime is 78238483. The reversal of 78238456 is 65483287.

It is a super-2 number, since 2×78238456² = 12242511994527872, which contains 22 as substring.

It is a Smith number, since the sum of its digits (43) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 717730 + ... + 717838.

It is an arithmetic number, because the mean of its divisors is an integer number (2494800).

Almost surely, 2^78238456 is an apocalyptic number.

It is an amenable number.

78238456 is an abundant number, since it is smaller than the sum of its proper divisors (81428744).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78238456 is a wasteful number, since it uses less digits than its factorization.

78238456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268 (or 264 counting only the distinct ones).

The product of its digits is 322560, while the sum is 43.

The square root of 78238456 is about 8845.2504769509. The cubic root of 78238456 is about 427.7008274073.

The spelling of 78238456 in words is "seventy-eight million, two hundred thirty-eight thousand, four hundred fifty-six".