74221440 has 256 divisors, whose sum is σ = 258508800. Its totient is φ = 18063360.

The previous prime is 74221421. The next prime is 74221457. The reversal of 74221440 is 4412247.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 74221440.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1726059 + ... + 1726101.

It is an arithmetic number, because the mean of its divisors is an integer number (1009800).

Almost surely, 2^74221440 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 74221440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (129254400).

74221440 is an abundant number, since it is smaller than the sum of its proper divisors (184287360).

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

74221440 is a wasteful number, since it uses less digits than its factorization.

74221440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125 (or 113 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 24.

The square root of 74221440 is about 8615.1865911308. The cubic root of 74221440 is about 420.2520029612.

Adding to 74221440 its reverse (4412247), we get a palindrome (78633687).

The spelling of 74221440 in words is "seventy-four million, two hundred twenty-one thousand, four hundred forty".