40428666 has 32 divisors (see below), whose sum is σ = 90694080. Its totient is φ = 13348368.

The previous prime is 40428653. The next prime is 40428677. The reversal of 40428666 is 66682404.

It is a happy number.

40428666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 40428666.

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 15 ways as a sum of consecutive naturals, for example, 2280 + ... + 9276.

It is an arithmetic number, because the mean of its divisors is an integer number (2834190).

Almost surely, 2^40428666 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40428666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45347040).

40428666 is an abundant number, since it is smaller than the sum of its proper divisors (50265414).

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

40428666 is a wasteful number, since it uses less digits than its factorization.

40428666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7115 (or 7109 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 36.

The square root of 40428666 is about 6358.3540322948. The cubic root of 40428666 is about 343.2125319401.

The spelling of 40428666 in words is "forty million, four hundred twenty-eight thousand, six hundred sixty-six".