40644520 has 96 divisors (see below), whose sum is σ = 108037800. Its totient is φ = 13719552.

The previous prime is 40644517. The next prime is 40644529. The reversal of 40644520 is 2544604.

40644520 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 20196036 + 20448484 = 4494^2 + 4522^2 .

It is not an unprimeable number, because it can be changed into a prime (40644529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 174324 + ... + 174556.

Almost surely, 2^40644520 is an apocalyptic number.

40644520 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40644520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54018900).

40644520 is an abundant number, since it is smaller than the sum of its proper divisors (67393280).

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

40644520 is a wasteful number, since it uses less digits than its factorization.

40644520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 347 (or 336 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 25.

The square root of 40644520 is about 6375.3054828769. The cubic root of 40644520 is about 343.8222671202.

The spelling of 40644520 in words is "forty million, six hundred forty-four thousand, five hundred twenty".