40638628 has 24 divisors (see below), whose sum is σ = 73946880. Its totient is φ = 19518240.

The previous prime is 40638601. The next prime is 40638629. The reversal of 40638628 is 82683604.

It is not an unprimeable number, because it can be changed into a prime (40638629) 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, 25083 + ... + 26653.

It is an arithmetic number, because the mean of its divisors is an integer number (3081120).

Almost surely, 2^40638628 is an apocalyptic number.

It is an amenable number.

40638628 is a deficient number, since it is larger than the sum of its proper divisors (33308252).

40638628 is a wasteful number, since it uses less digits than its factorization.

40638628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1827 (or 1825 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 37.

The square root of 40638628 is about 6374.8433706249. The cubic root of 40638628 is about 343.8056523449.

The spelling of 40638628 in words is "forty million, six hundred thirty-eight thousand, six hundred twenty-eight".