78418278 has 24 divisors (see below), whose sum is σ = 173523168. Its totient is φ = 25582992.

The previous prime is 78418259. The next prime is 78418321. The reversal of 78418278 is 87281487.

It is a super-2 number, since 2×78418278² = 12298852648970568, which contains 22 as substring.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 45501 + ... + 47192.

It is an arithmetic number, because the mean of its divisors is an integer number (7230132).

Almost surely, 2^78418278 is an apocalyptic number.

78418278 is an abundant number, since it is smaller than the sum of its proper divisors (95104890).

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

78418278 is a wasteful number, since it uses less digits than its factorization.

78418278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92748 (or 92745 counting only the distinct ones).

The product of its digits is 200704, while the sum is 45.

The square root of 78418278 is about 8855.4095331611. The cubic root of 78418278 is about 428.0282502388.

The spelling of 78418278 in words is "seventy-eight million, four hundred eighteen thousand, two hundred seventy-eight".