74189720 has 64 divisors (see below), whose sum is σ = 190045440. Its totient is φ = 25801600.

The previous prime is 74189719. The next prime is 74189723. The reversal of 74189720 is 2798147.

It is a super-2 number, since 2×74189720² = 11008229107356800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74189723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6455 + ... + 13785.

It is an arithmetic number, because the mean of its divisors is an integer number (2969460).

Almost surely, 2^74189720 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 74189720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95022720).

74189720 is an abundant number, since it is smaller than the sum of its proper divisors (115855720).

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

74189720 is a wasteful number, since it uses less digits than its factorization.

74189720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7376 (or 7372 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 38.

The square root of 74189720 is about 8613.3454592278. The cubic root of 74189720 is about 420.1921267629.

The spelling of 74189720 in words is "seventy-four million, one hundred eighty-nine thousand, seven hundred twenty".