40320666 has 20 divisors (see below), whose sum is σ = 90348522. Its totient is φ = 13440168.

The previous prime is 40320661. The next prime is 40320691. The reversal of 40320666 is 66602304.

It can be written as a sum of positive squares in only one way, i.e., 38007225 + 2313441 = 6165^2 + 1521^2 .

It is a super-2 number, since 2×40320666² = 3251512213367112, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (40320661) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 124285 + ... + 124608.

Almost surely, 2^40320666 is an apocalyptic number.

40320666 is an abundant number, since it is smaller than the sum of its proper divisors (50027856).

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

40320666 is a wasteful number, since it uses less digits than its factorization.

40320666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248907 (or 248898 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 27.

The square root of 40320666 is about 6349.8555889091. The cubic root of 40320666 is about 342.9066432994.

The spelling of 40320666 in words is "forty million, three hundred twenty thousand, six hundred sixty-six".