40644624 has 40 divisors (see below), whose sum is σ = 106030912. Its totient is φ = 13415040.

The previous prime is 40644623. The next prime is 40644661. The reversal of 40644624 is 42644604.

It is a junction number, because it is equal to n+sod(n) for n = 40644591 and 40644600.

It is not an unprimeable number, because it can be changed into a prime (40644623) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 834 + ... + 9054.

Almost surely, 2^40644624 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 40644624, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (53015456).

40644624 is an abundant number, since it is smaller than the sum of its proper divisors (65386288).

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

40644624 is a wasteful number, since it uses less digits than its factorization.

40644624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8335 (or 8329 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 30.

The square root of 40644624 is about 6375.3136393436. The cubic root of 40644624 is about 343.8225603740.

The spelling of 40644624 in words is "forty million, six hundred forty-four thousand, six hundred twenty-four".