74321440 has 48 divisors (see below), whose sum is σ = 176456448. Its totient is φ = 29581056.

The previous prime is 74321417. The next prime is 74321449. The reversal of 74321440 is 4412347.

It is not an unprimeable number, because it can be changed into a prime (74321449) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34639 + ... + 36721.

It is an arithmetic number, because the mean of its divisors is an integer number (3676176).

Almost surely, 2^74321440 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 74321440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88228224).

74321440 is an abundant number, since it is smaller than the sum of its proper divisors (102135008).

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

74321440 is a wasteful number, since it uses less digits than its factorization.

74321440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2321 (or 2313 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 25.

The square root of 74321440 is about 8620.9883424118. The cubic root of 74321440 is about 420.4406561797.

Adding to 74321440 its reverse (4412347), we get a palindrome (78733787).

The spelling of 74321440 in words is "seventy-four million, three hundred twenty-one thousand, four hundred forty".