74218224 has 80 divisors (see below), whose sum is σ = 198201600. Its totient is φ = 23920128.

The previous prime is 74218219. The next prime is 74218253. The reversal of 74218224 is 42281247.

It is a Cunningham number, because it is equal to 8615²-1.

It is a junction number, because it is equal to n+sod(n) for n = 74218191 and 74218200.

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, 206557 + ... + 206915.

It is an arithmetic number, because the mean of its divisors is an integer number (2477520).

Almost surely, 2^74218224 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 74218224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99100800).

74218224 is an abundant number, since it is smaller than the sum of its proper divisors (123983376).

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

74218224 is a wasteful number, since it uses less digits than its factorization.

74218224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 502 (or 496 counting only the distinct ones).

The product of its digits is 7168, while the sum is 30.

The square root of 74218224 is about 8614.9999419617. Note that the first 4 decimals coincide. The cubic root of 74218224 is about 420.2459330621.

The spelling of 74218224 in words is "seventy-four million, two hundred eighteen thousand, two hundred twenty-four".