74273281 has 4 divisors (see below), whose sum is σ = 74364352. Its totient is φ = 74182212.

The previous prime is 74273249. The next prime is 74273291. The reversal of 74273281 is 18237247.

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 74273281 - 2⁵ = 74273249 is a prime.

It is a super-2 number, since 2×74273281² = 11033040541009922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (74273231) 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, 44301 + ... + 45946.

It is an arithmetic number, because the mean of its divisors is an integer number (18591088).

Almost surely, 2^74273281 is an apocalyptic number.

It is an amenable number.

74273281 is a deficient number, since it is larger than the sum of its proper divisors (91071).

74273281 is an equidigital number, since it uses as much as digits as its factorization.

74273281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91070.

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

The square root of 74273281 is about 8618.1947645664. The cubic root of 74273281 is about 420.3498238143.

The spelling of 74273281 in words is "seventy-four million, two hundred seventy-three thousand, two hundred eighty-one".