40665428 has 48 divisors (see below), whose sum is σ = 78962688. Its totient is φ = 18240000.

The previous prime is 40665389. The next prime is 40665431. The reversal of 40665428 is 82456604.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 212813 + ... + 213003.

It is an arithmetic number, because the mean of its divisors is an integer number (1645056).

Almost surely, 2^40665428 is an apocalyptic number.

It is an amenable number.

40665428 is a deficient number, since it is larger than the sum of its proper divisors (38297260).

40665428 is a wasteful number, since it uses less digits than its factorization.

40665428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344 (or 342 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 35.

The square root of 40665428 is about 6376.9450366143. The cubic root of 40665428 is about 343.8812123660.

The spelling of 40665428 in words is "forty million, six hundred sixty-five thousand, four hundred twenty-eight".