40638564 has 24 divisors (see below), whose sum is σ = 105359520. Its totient is φ = 13546152.

The previous prime is 40638523. The next prime is 40638571. The reversal of 40638564 is 46583604.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 188034 + ... + 188249.

It is an arithmetic number, because the mean of its divisors is an integer number (4389980).

Almost surely, 2^40638564 is an apocalyptic number.

It is an amenable number.

40638564 is an abundant number, since it is smaller than the sum of its proper divisors (64720956).

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

40638564 is a wasteful number, since it uses less digits than its factorization.

40638564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 376296 (or 376288 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The square root of 40638564 is about 6374.8383508917. The cubic root of 40638564 is about 343.8054718633.

The spelling of 40638564 in words is "forty million, six hundred thirty-eight thousand, five hundred sixty-four".