74213665 has 4 divisors (see below), whose sum is σ = 89056404. Its totient is φ = 59370928.

The previous prime is 74213651. The next prime is 74213683. The reversal of 74213665 is 56631247.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15492096 + 58721569 = 3936^2 + 7663^2 .

It is a cyclic number.

It is not a de Polignac number, because 74213665 - 2²⁵ = 40659233 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 74213665.

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, 7421362 + ... + 7421371.

It is an arithmetic number, because the mean of its divisors is an integer number (22264101).

Almost surely, 2^74213665 is an apocalyptic number.

It is an amenable number.

74213665 is a deficient number, since it is larger than the sum of its proper divisors (14842739).

74213665 is a wasteful number, since it uses less digits than its factorization.

74213665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14842738.

The product of its digits is 30240, while the sum is 34.

The square root of 74213665 is about 8614.7353412627. The cubic root of 74213665 is about 420.2373280756.

The spelling of 74213665 in words is "seventy-four million, two hundred thirteen thousand, six hundred sixty-five".