74644021 has 4 divisors (see below), whose sum is σ = 74913772. Its totient is φ = 74374272.

The previous prime is 74644013. The next prime is 74644079. The reversal of 74644021 is 12044647.

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 27447121 + 47196900 = 5239^2 + 6870^2 .

It is a cyclic number.

It is not a de Polignac number, because 74644021 - 2³ = 74644013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74644081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 134460 + ... + 135013.

It is an arithmetic number, because the mean of its divisors is an integer number (18728443).

Almost surely, 2^74644021 is an apocalyptic number.

It is an amenable number.

74644021 is a deficient number, since it is larger than the sum of its proper divisors (269751).

74644021 is a wasteful number, since it uses less digits than its factorization.

74644021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269750.

The product of its (nonzero) digits is 5376, while the sum is 28.

The square root of 74644021 is about 8639.6771351712. The cubic root of 74644021 is about 421.0480646541.

Adding to 74644021 its reverse (12044647), we get a palindrome (86688668).

The spelling of 74644021 in words is "seventy-four million, six hundred forty-four thousand, twenty-one".