74221865 has 4 divisors (see below), whose sum is σ = 89066244. Its totient is φ = 59377488.

The previous prime is 74221853. The next prime is 74221867. The reversal of 74221865 is 56812247.

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 13957696 + 60264169 = 3736^2 + 7763^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-74221865 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (74221867) by changing a digit.

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, 7422182 + ... + 7422191.

It is an arithmetic number, because the mean of its divisors is an integer number (22266561).

Almost surely, 2^74221865 is an apocalyptic number.

It is an amenable number.

74221865 is a deficient number, since it is larger than the sum of its proper divisors (14844379).

74221865 is a wasteful number, since it uses less digits than its factorization.

74221865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14844378.

The product of its digits is 26880, while the sum is 35.

The square root of 74221865 is about 8615.2112568410. The cubic root of 74221865 is about 420.2528050958.

The spelling of 74221865 in words is "seventy-four million, two hundred twenty-one thousand, eight hundred sixty-five".