72643583 has 4 divisors (see below), whose sum is σ = 72808008. Its totient is φ = 72479160.

The previous prime is 72643559. The next prime is 72643607. The reversal of 72643583 is 38534627.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (72643559) and next prime (72643607).

It is a cyclic number.

It is not a de Polignac number, because 72643583 - 2¹⁴ = 72627199 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72643183) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81548 + ... + 82433.

It is an arithmetic number, because the mean of its divisors is an integer number (18202002).

Almost surely, 2^72643583 is an apocalyptic number.

72643583 is a deficient number, since it is larger than the sum of its proper divisors (164425).

72643583 is a wasteful number, since it uses less digits than its factorization.

72643583 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164424.

The product of its digits is 120960, while the sum is 38.

The square root of 72643583 is about 8523.1204966256. The cubic root of 72643583 is about 417.2526326966.

The spelling of 72643583 in words is "seventy-two million, six hundred forty-three thousand, five hundred eighty-three".