78427224 has 64 divisors (see below), whose sum is σ = 218793600. Its totient is φ = 26029728.

The previous prime is 78427213. The next prime is 78427247. The reversal of 78427224 is 42272487.

78427224 is a `hidden beast` number, since 7 + 8 + 427 + 224 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 60487 + ... + 61769.

It is an arithmetic number, because the mean of its divisors is an integer number (3418650).

Almost surely, 2^78427224 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78427224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (109396800).

78427224 is an abundant number, since it is smaller than the sum of its proper divisors (140366376).

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

78427224 is a wasteful number, since it uses less digits than its factorization.

78427224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1581 (or 1571 counting only the distinct ones).

The product of its digits is 50176, while the sum is 36.

The square root of 78427224 is about 8855.9146337349. The cubic root of 78427224 is about 428.0445261855.

The spelling of 78427224 in words is "seventy-eight million, four hundred twenty-seven thousand, two hundred twenty-four".