74218220 has 24 divisors (see below), whose sum is σ = 156131808. Its totient is φ = 29635200.

The previous prime is 74218219. The next prime is 74218253. The reversal of 74218220 is 2281247.

It is a self number, because there is not a number n which added to its sum of digits gives 74218220.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9680 + ... + 15560.

It is an arithmetic number, because the mean of its divisors is an integer number (6505492).

Almost surely, 2^74218220 is an apocalyptic number.

It is an amenable number.

74218220 is an abundant number, since it is smaller than the sum of its proper divisors (81913588).

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

74218220 is a wasteful number, since it uses less digits than its factorization.

74218220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6521 (or 6519 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 26.

The square root of 74218220 is about 8614.9997098085. Note that the first 3 decimals coincide. The cubic root of 74218220 is about 420.2459255124.

Adding to 74218220 its reverse (2281247), we get a palindrome (76499467).

The spelling of 74218220 in words is "seventy-four million, two hundred eighteen thousand, two hundred twenty".