72274581 has 12 divisors (see below), whose sum is σ = 104472108. Its totient is φ = 48148224.

The previous prime is 72274577. The next prime is 72274619. The reversal of 72274581 is 18547227.

72274581 is a `hidden beast` number, since 7 + 2 + 2 + 74 + 581 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 61873956 + 10400625 = 7866^2 + 3225^2 .

It is not a de Polignac number, because 72274581 - 2² = 72274577 is a prime.

It is a super-2 number, since 2×72274581² = 10447230117451122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72274381) 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 11 ways as a sum of consecutive naturals, for example, 18691 + ... + 22223.

It is an arithmetic number, because the mean of its divisors is an integer number (8706009).

Almost surely, 2^72274581 is an apocalyptic number.

It is an amenable number.

72274581 is a deficient number, since it is larger than the sum of its proper divisors (32197527).

72274581 is a wasteful number, since it uses less digits than its factorization.

72274581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5812 (or 5809 counting only the distinct ones).

The product of its digits is 31360, while the sum is 36.

The square root of 72274581 is about 8501.4458182123. The cubic root of 72274581 is about 416.5449377382.

The spelling of 72274581 in words is "seventy-two million, two hundred seventy-four thousand, five hundred eighty-one".