74281440721 has 8 divisors (see below), whose sum is σ = 79171807104. Its totient is φ = 69448948800.

The previous prime is 74281440719. The next prime is 74281440787. The reversal of 74281440721 is 12704418247.

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

It is a cyclic number.

It is not a de Polignac number, because 74281440721 - 2¹ = 74281440719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (74281446721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14465965 + ... + 14471098.

It is an arithmetic number, because the mean of its divisors is an integer number (9896475888).

Almost surely, 2^74281440721 is an apocalyptic number.

It is an amenable number.

74281440721 is a deficient number, since it is larger than the sum of its proper divisors (4890366383).

74281440721 is a wasteful number, since it uses less digits than its factorization.

74281440721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28937231.

The product of its (nonzero) digits is 100352, while the sum is 40.

Adding to 74281440721 its reverse (12704418247), we get a palindrome (86985858968).

The spelling of 74281440721 in words is "seventy-four billion, two hundred eighty-one million, four hundred forty thousand, seven hundred twenty-one".