40644068 has 6 divisors (see below), whose sum is σ = 71127126. Its totient is φ = 20322032.

The previous prime is 40644061. The next prime is 40644077. The reversal of 40644068 is 86044604.

40644068 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 29138404 + 11505664 = 5398^2 + 3392^2 .

It is not an unprimeable number, because it can be changed into a prime (40644061) by changing a digit.

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 as a sum of consecutive naturals, namely, 5080505 + ... + 5080512.

It is an arithmetic number, because the mean of its divisors is an integer number (11854521).

Almost surely, 2^40644068 is an apocalyptic number.

It is an amenable number.

40644068 is a deficient number, since it is larger than the sum of its proper divisors (30483058).

40644068 is a wasteful number, since it uses less digits than its factorization.

40644068 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10161021 (or 10161019 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 32.

The square root of 40644068 is about 6375.2700334966. The cubic root of 40644068 is about 343.8209925880.

The spelling of 40644068 in words is "forty million, six hundred forty-four thousand, sixty-eight".