74809621 has 4 divisors (see below), whose sum is σ = 75536032. Its totient is φ = 74083212.

The previous prime is 74809613. The next prime is 74809627. The reversal of 74809621 is 12690847.

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 74809621 - 2³ = 74809613 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 (74809627) 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, 363051 + ... + 363256.

It is an arithmetic number, because the mean of its divisors is an integer number (18884008).

Almost surely, 2^74809621 is an apocalyptic number.

It is an amenable number.

74809621 is a deficient number, since it is larger than the sum of its proper divisors (726411).

74809621 is a wasteful number, since it uses less digits than its factorization.

74809621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 726410.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 74809621 is about 8649.2555170951. The cubic root of 74809621 is about 421.3592039313.

The spelling of 74809621 in words is "seventy-four million, eight hundred nine thousand, six hundred twenty-one".