40668220 has 24 divisors (see below), whose sum is σ = 86287824. Its totient is φ = 16098816.

The previous prime is 40668197. The next prime is 40668223. The reversal of 40668220 is 2286604.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40668223) 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, 8542 + ... + 12421.

It is an arithmetic number, because the mean of its divisors is an integer number (3595326).

Almost surely, 2^40668220 is an apocalyptic number.

It is an amenable number.

40668220 is an abundant number, since it is smaller than the sum of its proper divisors (45619604).

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

40668220 is a wasteful number, since it uses less digits than its factorization.

40668220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21069 (or 21067 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 40668220 is about 6377.1639464577. The cubic root of 40668220 is about 343.8890822317.

The spelling of 40668220 in words is "forty million, six hundred sixty-eight thousand, two hundred twenty".