40000028 has 12 divisors (see below), whose sum is σ = 70081032. Its totient is φ = 19976880.

The previous prime is 40000021. The next prime is 40000033. The reversal of 40000028 is 82000004.

It is a junction number, because it is equal to n+sod(n) for n = 39999967 and 40000021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40000021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1550 + ... + 9077.

It is an arithmetic number, because the mean of its divisors is an integer number (5840086).

Almost surely, 2^40000028 is an apocalyptic number.

It is an amenable number.

40000028 is a deficient number, since it is larger than the sum of its proper divisors (30081004).

40000028 is a wasteful number, since it uses less digits than its factorization.

40000028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11572 (or 11570 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 40000028 is about 6324.5575339307. The cubic root of 40000028 is about 341.9952691342.

The spelling of 40000028 in words is "forty million, twenty-eight", and thus it is an aban number and an uban number.