74207621 has 4 divisors (see below), whose sum is σ = 74280492. Its totient is φ = 74134752.

The previous prime is 74207611. The next prime is 74207633. The reversal of 74207621 is 12670247.

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 60062500 + 14145121 = 7750^2 + 3761^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-74207621 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 (74207611) 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, 34886 + ... + 36951.

It is an arithmetic number, because the mean of its divisors is an integer number (18570123).

Almost surely, 2^74207621 is an apocalyptic number.

It is an amenable number.

74207621 is a deficient number, since it is larger than the sum of its proper divisors (72871).

74207621 is a wasteful number, since it uses less digits than its factorization.

74207621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72870.

The product of its (nonzero) digits is 4704, while the sum is 29.

The square root of 74207621 is about 8614.3845398264. The cubic root of 74207621 is about 420.2259196494.

Adding to 74207621 its reverse (12670247), we get a palindrome (86877868).

The spelling of 74207621 in words is "seventy-four million, two hundred seven thousand, six hundred twenty-one".