74039666 has 16 divisors (see below), whose sum is σ = 113718168. Its totient is φ = 36144000.

The previous prime is 74039663. The next prime is 74039677. The reversal of 74039666 is 66693047.

74039666 = 469² + 470² + ... + 687².

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 71893441 + 2146225 = 8479^2 + 1465^2 .

It is not an unprimeable number, because it can be changed into a prime (74039663) 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, 12236 + ... + 17256.

Almost surely, 2^74039666 is an apocalyptic number.

74039666 is a deficient number, since it is larger than the sum of its proper divisors (39678502).

74039666 is a wasteful number, since it uses less digits than its factorization.

74039666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5197.

The product of its (nonzero) digits is 163296, while the sum is 41.

The square root of 74039666 is about 8604.6304975867. The cubic root of 74039666 is about 419.9086460419.

The spelling of 74039666 in words is "seventy-four million, thirty-nine thousand, six hundred sixty-six".