74244721 has 8 divisors (see below), whose sum is σ = 76784384. Its totient is φ = 71714160.

The previous prime is 74244697. The next prime is 74244739. The reversal of 74244721 is 12744247.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 74244721 - 2⁵ = 74244689 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (74244221) 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 7 ways as a sum of consecutive naturals, for example, 17050 + ... + 20956.

It is an arithmetic number, because the mean of its divisors is an integer number (9598048).

Almost surely, 2^74244721 is an apocalyptic number.

It is an amenable number.

74244721 is a deficient number, since it is larger than the sum of its proper divisors (2539663).

74244721 is a wasteful number, since it uses less digits than its factorization.

74244721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4551.

The product of its digits is 12544, while the sum is 31.

The square root of 74244721 is about 8616.5376457136. The cubic root of 74244721 is about 420.2959384426.

Adding to 74244721 its reverse (12744247), we get a palindrome (86988968).

The spelling of 74244721 in words is "seventy-four million, two hundred forty-four thousand, seven hundred twenty-one".