74015540 has 48 divisors (see below), whose sum is σ = 165186000. Its totient is φ = 27804672.

The previous prime is 74015533. The next prime is 74015563. The reversal of 74015540 is 4551047.

It can be written as a sum of positive squares in 8 ways, for example, as 2579236 + 71436304 = 1606^2 + 8452^2 .

It is a super-2 number, since 2×74015540² = 10956600322983200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19736 + ... + 23184.

It is an arithmetic number, because the mean of its divisors is an integer number (3441375).

Almost surely, 2^74015540 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 74015540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82593000).

74015540 is an abundant number, since it is smaller than the sum of its proper divisors (91170460).

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

74015540 is a wasteful number, since it uses less digits than its factorization.

74015540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3524 (or 3522 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 26.

The square root of 74015540 is about 8603.2284637803. The cubic root of 74015540 is about 419.8630316791.

Adding to 74015540 its reverse (4551047), we get a palindrome (78566587).

The spelling of 74015540 in words is "seventy-four million, fifteen thousand, five hundred forty".