78474228 has 48 divisors (see below), whose sum is σ = 211244544. Its totient is φ = 22209120.

The previous prime is 78474217. The next prime is 78474233. The reversal of 78474228 is 82247487.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 78474228.

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, 4623 + ... + 13353.

It is an arithmetic number, because the mean of its divisors is an integer number (4400928).

Almost surely, 2^78474228 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 78474228, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (105622272).

78474228 is an abundant number, since it is smaller than the sum of its proper divisors (132770316).

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

78474228 is a wasteful number, since it uses less digits than its factorization.

78474228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8852 (or 8850 counting only the distinct ones).

The product of its digits is 200704, while the sum is 42.

The square root of 78474228 is about 8858.5680558429. The cubic root of 78474228 is about 428.1300228015.

The spelling of 78474228 in words is "seventy-eight million, four hundred seventy-four thousand, two hundred twenty-eight".