72643227 has 16 divisors (see below), whose sum is σ = 102850560. Its totient is φ = 45448832.

The previous prime is 72643217. The next prime is 72643237. The reversal of 72643227 is 72234627.

It is an interprime number because it is at equal distance from previous prime (72643217) and next prime (72643237).

It is a cyclic number.

It is not a de Polignac number, because 72643227 - 2⁸ = 72642971 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72643217) 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 15 ways as a sum of consecutive naturals, for example, 17674 + ... + 21392.

It is an arithmetic number, because the mean of its divisors is an integer number (6428160).

Almost surely, 2^72643227 is an apocalyptic number.

72643227 is a deficient number, since it is larger than the sum of its proper divisors (30207333).

72643227 is a wasteful number, since it uses less digits than its factorization.

72643227 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4122.

The product of its digits is 28224, while the sum is 33.

The square root of 72643227 is about 8523.0996122303. The cubic root of 72643227 is about 417.2519510940.

The spelling of 72643227 in words is "seventy-two million, six hundred forty-three thousand, two hundred twenty-seven".