40128668 has 12 divisors (see below), whose sum is σ = 71938272. Its totient is φ = 19574880.

The previous prime is 40128659. The next prime is 40128679. The reversal of 40128668 is 86682104.

It is a super-2 number, since 2×40128668² = 3220619990908448, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 122180 + ... + 122507.

It is an arithmetic number, because the mean of its divisors is an integer number (5994856).

Almost surely, 2^40128668 is an apocalyptic number.

It is an amenable number.

40128668 is a deficient number, since it is larger than the sum of its proper divisors (31809604).

40128668 is a wasteful number, since it uses less digits than its factorization.

40128668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244732 (or 244730 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 35.

The square root of 40128668 is about 6334.7192518690. The cubic root of 40128668 is about 342.3614954918.

The spelling of 40128668 in words is "forty million, one hundred twenty-eight thousand, six hundred sixty-eight".