74090645 has 4 divisors (see below), whose sum is σ = 88908780. Its totient is φ = 59272512.

The previous prime is 74090629. The next prime is 74090669. The reversal of 74090645 is 54609047.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54609047 = 293 ⋅186379.

It can be written as a sum of positive squares in 2 ways, for example, as 57623281 + 16467364 = 7591^2 + 4058^2 .

It is a cyclic number.

It is not a de Polignac number, because 74090645 - 2⁴ = 74090629 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7409060 + ... + 7409069.

It is an arithmetic number, because the mean of its divisors is an integer number (22227195).

Almost surely, 2^74090645 is an apocalyptic number.

It is an amenable number.

74090645 is a deficient number, since it is larger than the sum of its proper divisors (14818135).

74090645 is a wasteful number, since it uses less digits than its factorization.

74090645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14818134.

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 74090645 is about 8607.5922882070. The cubic root of 74090645 is about 420.0049980509.

The spelling of 74090645 in words is "seventy-four million, ninety thousand, six hundred forty-five".