74330821 has 4 divisors (see below), whose sum is σ = 74351200. Its totient is φ = 74310444.

The previous prime is 74330813. The next prime is 74330833. The reversal of 74330821 is 12803347.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 74330821 - 2³ = 74330813 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 74330821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74330021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3051 + ... + 12568.

It is an arithmetic number, because the mean of its divisors is an integer number (18587800).

Almost surely, 2^74330821 is an apocalyptic number.

It is an amenable number.

74330821 is a deficient number, since it is larger than the sum of its proper divisors (20379).

74330821 is a wasteful number, since it uses less digits than its factorization.

74330821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20378.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 74330821 is about 8621.5324043931. The cubic root of 74330821 is about 420.4583450542.

The spelling of 74330821 in words is "seventy-four million, three hundred thirty thousand, eight hundred twenty-one".