74443540 has 12 divisors (see below), whose sum is σ = 156331476. Its totient is φ = 29777408.

The previous prime is 74443531. The next prime is 74443541. The reversal of 74443540 is 4534447.

It can be written as a sum of positive squares in 2 ways, for example, as 27081616 + 47361924 = 5204^2 + 6882^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74443541) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1861069 + ... + 1861108.

It is an arithmetic number, because the mean of its divisors is an integer number (13027623).

Almost surely, 2^74443540 is an apocalyptic number.

It is an amenable number.

74443540 is an abundant number, since it is smaller than the sum of its proper divisors (81887936).

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

74443540 is a wasteful number, since it uses less digits than its factorization.

74443540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3722186 (or 3722184 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 31.

The square root of 74443540 is about 8628.0669909314. The cubic root of 74443540 is about 420.6707724475.

Adding to 74443540 its reverse (4534447), we get a palindrome (78977987).

The spelling of 74443540 in words is "seventy-four million, four hundred forty-three thousand, five hundred forty".