40668720 has 80 divisors (see below), whose sum is σ = 129179232. Its totient is φ = 10577920.

The previous prime is 40668703. The next prime is 40668751. The reversal of 40668720 is 2786604.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 7774 + ... + 11906.

Almost surely, 2^40668720 is an apocalyptic number.

40668720 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40668720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64589616).

40668720 is an abundant number, since it is smaller than the sum of its proper divisors (88510512).

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

40668720 is a wasteful number, since it uses less digits than its factorization.

40668720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4190 (or 4184 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 33.

The square root of 40668720 is about 6377.2031487165. The cubic root of 40668720 is about 343.8904915536.

The spelling of 40668720 in words is "forty million, six hundred sixty-eight thousand, seven hundred twenty".