74484721 has 4 divisors (see below), whose sum is σ = 75705844. Its totient is φ = 73263600.

The previous prime is 74484719. The next prime is 74484763. The reversal of 74484721 is 12748447.

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 43560000 + 30924721 = 6600^2 + 5561^2 .

It is a cyclic number.

It is not a de Polignac number, because 74484721 - 2¹ = 74484719 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (74484791) 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, 610470 + ... + 610591.

It is an arithmetic number, because the mean of its divisors is an integer number (18926461).

Almost surely, 2^74484721 is an apocalyptic number.

It is an amenable number.

74484721 is a deficient number, since it is larger than the sum of its proper divisors (1221123).

74484721 is a wasteful number, since it uses less digits than its factorization.

74484721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1221122.

The product of its digits is 50176, while the sum is 37.

The square root of 74484721 is about 8630.4531167257. The cubic root of 74484721 is about 420.7483276421.

The spelling of 74484721 in words is "seventy-four million, four hundred eighty-four thousand, seven hundred twenty-one".