73247281 has 4 divisors (see below), whose sum is σ = 74340592. Its totient is φ = 72153972.

The previous prime is 73247263. The next prime is 73247329. The reversal of 73247281 is 18274237.

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 a de Polignac number, because none of the positive numbers 2^k-73247281 is a prime.

It is a super-2 number, since 2×73247281² = 10730328347785922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (73247201) 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 3 ways as a sum of consecutive naturals, for example, 546555 + ... + 546688.

It is an arithmetic number, because the mean of its divisors is an integer number (18585148).

Almost surely, 2^73247281 is an apocalyptic number.

It is an amenable number.

73247281 is a deficient number, since it is larger than the sum of its proper divisors (1093311).

73247281 is a wasteful number, since it uses less digits than its factorization.

73247281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1093310.

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

The square root of 73247281 is about 8558.4625371617. The cubic root of 73247281 is about 418.4052924401.

The spelling of 73247281 in words is "seventy-three million, two hundred forty-seven thousand, two hundred eighty-one".