72267281 has 4 divisors (see below), whose sum is σ = 72300864. Its totient is φ = 72233700.

The previous prime is 72267277. The next prime is 72267287. The reversal of 72267281 is 18276227.

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 72267281 - 2² = 72267277 is a prime.

It is a super-2 number, since 2×72267281² = 10445119806265922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72267287) 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, 13325 + ... + 17946.

It is an arithmetic number, because the mean of its divisors is an integer number (18075216).

Almost surely, 2^72267281 is an apocalyptic number.

It is an amenable number.

72267281 is a deficient number, since it is larger than the sum of its proper divisors (33583).

72267281 is a wasteful number, since it uses less digits than its factorization.

72267281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33582.

The product of its digits is 18816, while the sum is 35.

The square root of 72267281 is about 8501.0164686348. The cubic root of 72267281 is about 416.5309130729.

The spelling of 72267281 in words is "seventy-two million, two hundred sixty-seven thousand, two hundred eighty-one".