40661668 has 24 divisors (see below), whose sum is σ = 74874744. Its totient is φ = 19296000.

The previous prime is 40661639. The next prime is 40661669. The reversal of 40661668 is 86616604.

It can be written as a sum of positive squares in 4 ways, for example, as 3305124 + 37356544 = 1818^2 + 6112^2 .

It is a Harshad number since it is a multiple of its sum of digits (37).

It is not an unprimeable number, because it can be changed into a prime (40661669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2718 + ... + 9418.

It is an arithmetic number, because the mean of its divisors is an integer number (3119781).

Almost surely, 2^40661668 is an apocalyptic number.

It is an amenable number.

40661668 is a deficient number, since it is larger than the sum of its proper divisors (34213076).

40661668 is a wasteful number, since it uses less digits than its factorization.

40661668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6783 (or 6781 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 37.

The square root of 40661668 is about 6376.6502177868. The cubic root of 40661668 is about 343.8706134103.

The spelling of 40661668 in words is "forty million, six hundred sixty-one thousand, six hundred sixty-eight".