40640168 has 8 divisors (see below), whose sum is σ = 76200330. Its totient is φ = 20320080.

The previous prime is 40640167. The next prime is 40640177. The reversal of 40640168 is 86104604.

It can be written as a sum of positive squares in only one way, i.e., 37478884 + 3161284 = 6122^2 + 1778^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 40640168.

It is not an unprimeable number, because it can be changed into a prime (40640161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2540003 + ... + 2540018.

Almost surely, 2^40640168 is an apocalyptic number.

It is an amenable number.

40640168 is a deficient number, since it is larger than the sum of its proper divisors (35560162).

40640168 is a wasteful number, since it uses less digits than its factorization.

40640168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5080027 (or 5080023 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 40640168 is about 6374.9641567620. The cubic root of 40640168 is about 343.8099951262.

The spelling of 40640168 in words is "forty million, six hundred forty thousand, one hundred sixty-eight".