72226281 has 4 divisors (see below), whose sum is σ = 96301712. Its totient is φ = 48150852.

The previous prime is 72226267. The next prime is 72226291. The reversal of 72226281 is 18262227.

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: 18262227 = 3 ⋅6087409.

It is a de Polignac number, because none of the positive numbers 2^k-72226281 is a prime.

It is a super-2 number, since 2×72226281² = 10433271334181922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72226291) 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, 12037711 + ... + 12037716.

It is an arithmetic number, because the mean of its divisors is an integer number (24075428).

Almost surely, 2^72226281 is an apocalyptic number.

It is an amenable number.

72226281 is a deficient number, since it is larger than the sum of its proper divisors (24075431).

72226281 is a wasteful number, since it uses less digits than its factorization.

72226281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24075430.

The product of its digits is 5376, while the sum is 30.

The square root of 72226281 is about 8498.6046501764. The cubic root of 72226281 is about 416.4521268511.

The spelling of 72226281 in words is "seventy-two million, two hundred twenty-six thousand, two hundred eighty-one".