74993281 has 4 divisors (see below), whose sum is σ = 81810864. Its totient is φ = 68175700.

The previous prime is 74993279. The next prime is 74993291. The reversal of 74993281 is 18239947.

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.

It is a cyclic number.

It is not a de Polignac number, because 74993281 - 2¹ = 74993279 is a prime.

It is a super-2 number, since 2×74993281² = 11247984390289922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (74993221) 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, 3408775 + ... + 3408796.

It is an arithmetic number, because the mean of its divisors is an integer number (20452716).

Almost surely, 2^74993281 is an apocalyptic number.

It is an amenable number.

74993281 is a deficient number, since it is larger than the sum of its proper divisors (6817583).

74993281 is a wasteful number, since it uses less digits than its factorization.

74993281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6817582.

The product of its digits is 108864, while the sum is 43.

The square root of 74993281 is about 8659.8661075100. The cubic root of 74993281 is about 421.7037388879.

The spelling of 74993281 in words is "seventy-four million, nine hundred ninety-three thousand, two hundred eighty-one".