40404028 has 36 divisors (see below), whose sum is σ = 82628112. Its totient is φ = 17287200.

The previous prime is 40404017. The next prime is 40404043. The reversal of 40404028 is 82040404.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 66928 + ... + 67528.

Almost surely, 2^40404028 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 40404028, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41314056).

40404028 is an abundant number, since it is smaller than the sum of its proper divisors (42224084).

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

40404028 is an frugal number, since it uses more digits than its factorization.

40404028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 640 (or 610 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 22.

The square root of 40404028 is about 6356.4162859272. The cubic root of 40404028 is about 343.1427976851.

The spelling of 40404028 in words is "forty million, four hundred four thousand, twenty-eight".