40645668 has 48 divisors (see below), whose sum is σ = 108913280. Its totient is φ = 11556864.

The previous prime is 40645663. The next prime is 40645711. The reversal of 40645668 is 86654604.

It is not an unprimeable number, because it can be changed into a prime (40645663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18180 + ... + 20292.

Almost surely, 2^40645668 is an apocalyptic number.

It is an amenable number.

40645668 is an abundant number, since it is smaller than the sum of its proper divisors (68267612).

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

40645668 is a wasteful number, since it uses less digits than its factorization.

40645668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2356 (or 2354 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 39.

The square root of 40645668 is about 6375.3955171424. The cubic root of 40645668 is about 343.8255041637.

The spelling of 40645668 in words is "forty million, six hundred forty-five thousand, six hundred sixty-eight".