74868821 has 4 divisors (see below), whose sum is σ = 74889600. Its totient is φ = 74848044.

The previous prime is 74868811. The next prime is 74868839. The reversal of 74868821 is 12886847.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12886847 = 67 ⋅192341.

It is a cyclic number.

It is not a de Polignac number, because 74868821 - 2¹⁰ = 74867797 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 (74868811) 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, 3431 + ... + 12708.

It is an arithmetic number, because the mean of its divisors is an integer number (18722400).

Almost surely, 2^74868821 is an apocalyptic number.

It is an amenable number.

74868821 is a deficient number, since it is larger than the sum of its proper divisors (20779).

74868821 is a wasteful number, since it uses less digits than its factorization.

74868821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20778.

The product of its digits is 172032, while the sum is 44.

The square root of 74868821 is about 8652.6771001812. The cubic root of 74868821 is about 421.4703210468.

The spelling of 74868821 in words is "seventy-four million, eight hundred sixty-eight thousand, eight hundred twenty-one".