72636443 has 4 divisors (see below), whose sum is σ = 79239768. Its totient is φ = 66033120.

The previous prime is 72636433. The next prime is 72636451. The reversal of 72636443 is 34463627.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34463627 = 11 ⋅3133057.

It is a cyclic number.

It is not a de Polignac number, because 72636443 - 2¹⁰ = 72635419 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72636433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3301646 + ... + 3301667.

It is an arithmetic number, because the mean of its divisors is an integer number (19809942).

Almost surely, 2^72636443 is an apocalyptic number.

72636443 is a deficient number, since it is larger than the sum of its proper divisors (6603325).

72636443 is a wasteful number, since it uses less digits than its factorization.

72636443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6603324.

The product of its digits is 72576, while the sum is 35.

The square root of 72636443 is about 8522.7016256584. The cubic root of 72636443 is about 417.2389619254.

The spelling of 72636443 in words is "seventy-two million, six hundred thirty-six thousand, four hundred forty-three".