40667640 has 128 divisors (see below), whose sum is σ = 133056000. Its totient is φ = 9884160.

The previous prime is 40667639. The next prime is 40667651. The reversal of 40667640 is 4676604.

40667640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 204261 + ... + 204459.

It is an arithmetic number, because the mean of its divisors is an integer number (1039500).

Almost surely, 2^40667640 is an apocalyptic number.

40667640 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 40667640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (66528000).

40667640 is an abundant number, since it is smaller than the sum of its proper divisors (92388360).

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

40667640 is a wasteful number, since it uses less digits than its factorization.

40667640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 357 (or 353 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 33.

The square root of 40667640 is about 6377.1184715356. The cubic root of 40667640 is about 343.8874474039.

The spelling of 40667640 in words is "forty million, six hundred sixty-seven thousand, six hundred forty".