74615220 has 144 divisors (see below), whose sum is σ = 240589440. Its totient is φ = 18678528.

The previous prime is 74615209. The next prime is 74615237. The reversal of 74615220 is 2251647.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 277246 + ... + 277514.

It is an arithmetic number, because the mean of its divisors is an integer number (1670760).

Almost surely, 2^74615220 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 74615220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (120294720).

74615220 is an abundant number, since it is smaller than the sum of its proper divisors (165974220).

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

74615220 is a wasteful number, since it uses less digits than its factorization.

74615220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374 (or 369 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 74615220 is about 8638.0101875374. The cubic root of 74615220 is about 420.9939046328.

Adding to 74615220 its reverse (2251647), we get a palindrome (76866867).

The spelling of 74615220 in words is "seventy-four million, six hundred fifteen thousand, two hundred twenty".