78418872 has 48 divisors (see below), whose sum is σ = 242726640. Its totient is φ = 22405248.

The previous prime is 78418843. The next prime is 78418897. The reversal of 78418872 is 27881487.

It is a super-2 number, since 2×78418872² = 12299038971504768, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 77293 + ... + 78300.

It is an arithmetic number, because the mean of its divisors is an integer number (5056805).

Almost surely, 2^78418872 is an apocalyptic number.

78418872 is a gapful number since it is divisible by the number (72) formed by its first and last digit.

It is an amenable number.

78418872 is an abundant number, since it is smaller than the sum of its proper divisors (164307768).

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

78418872 is a wasteful number, since it uses less digits than its factorization.

78418872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155612 (or 155605 counting only the distinct ones).

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

The square root of 78418872 is about 8855.4430719191. The cubic root of 78418872 is about 428.0293309739.

The spelling of 78418872 in words is "seventy-eight million, four hundred eighteen thousand, eight hundred seventy-two".