40668890 has 16 divisors (see below), whose sum is σ = 73611720. Its totient is φ = 16176960.

The previous prime is 40668889. The next prime is 40668907. The reversal of 40668890 is 9886604.

It can be written as a sum of positive squares in 4 ways, for example, as 25090081 + 15578809 = 5009^2 + 3947^2 .

It is a super-2 number, since 2×40668890² = 3307917227664200, which contains 22 as substring.

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, 9425 + ... + 13044.

Almost surely, 2^40668890 is an apocalyptic number.

40668890 is a deficient number, since it is larger than the sum of its proper divisors (32942830).

40668890 is a wasteful number, since it uses less digits than its factorization.

40668890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22657.

The product of its (nonzero) digits is 82944, while the sum is 41.

The square root of 40668890 is about 6377.2164774296. The cubic root of 40668890 is about 343.8909707204.

It can be divided in two parts, 406 and 68890, that added together give a palindrome (69296).

The spelling of 40668890 in words is "forty million, six hundred sixty-eight thousand, eight hundred ninety".