72265281 has 16 divisors (see below), whose sum is σ = 105304320. Its totient is φ = 43717520.

The previous prime is 72265279. The next prime is 72265357. The reversal of 72265281 is 18256227.

It is not a de Polignac number, because 72265281 - 2¹ = 72265279 is a prime.

It is a super-2 number, since 2×72265281² = 10444541676017922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (72265201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20086 + ... + 23408.

It is an arithmetic number, because the mean of its divisors is an integer number (6581520).

Almost surely, 2^72265281 is an apocalyptic number.

It is an amenable number.

72265281 is a deficient number, since it is larger than the sum of its proper divisors (33039039).

72265281 is a wasteful number, since it uses less digits than its factorization.

72265281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3996.

The product of its digits is 13440, while the sum is 33.

The square root of 72265281 is about 8500.8988348292. The cubic root of 72265281 is about 416.5270705340.

The spelling of 72265281 in words is "seventy-two million, two hundred sixty-five thousand, two hundred eighty-one".