74382721 has 4 divisors (see below), whose sum is σ = 85008832. Its totient is φ = 63756612.

The previous prime is 74382703. The next prime is 74382727. The reversal of 74382721 is 12728347.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12728347 = 19 ⋅669913.

It is a cyclic number.

It is not a de Polignac number, because 74382721 - 2⁵ = 74382689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (74382727) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5313045 + ... + 5313058.

It is an arithmetic number, because the mean of its divisors is an integer number (21252208).

Almost surely, 2^74382721 is an apocalyptic number.

It is an amenable number.

74382721 is a deficient number, since it is larger than the sum of its proper divisors (10626111).

74382721 is a wasteful number, since it uses less digits than its factorization.

74382721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10626110.

The product of its digits is 18816, while the sum is 34.

The square root of 74382721 is about 8624.5417849298. The cubic root of 74382721 is about 420.5561811465.

The spelling of 74382721 in words is "seventy-four million, three hundred eighty-two thousand, seven hundred twenty-one".