40644540 has 72 divisors (see below), whose sum is σ = 123832800. Its totient is φ = 10790784.

The previous prime is 40644529. The next prime is 40644547. The reversal of 40644540 is 4544604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40644547) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 62497 + ... + 63143.

It is an arithmetic number, because the mean of its divisors is an integer number (1719900).

Almost surely, 2^40644540 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 40644540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (61916400).

40644540 is an abundant number, since it is smaller than the sum of its proper divisors (83188260).

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

40644540 is a wasteful number, since it uses less digits than its factorization.

40644540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1011 (or 1006 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 27.

The square root of 40644540 is about 6375.3070514290. The cubic root of 40644540 is about 343.8223235152.

The spelling of 40644540 in words is "forty million, six hundred forty-four thousand, five hundred forty".