72644843 has 4 divisors (see below), whose sum is σ = 72813048. Its totient is φ = 72476640.

The previous prime is 72644807. The next prime is 72644851. The reversal of 72644843 is 34844627.

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

It is a cyclic number.

It is not a de Polignac number, because 72644843 - 2¹² = 72640747 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 72644797 and 72644806.

It is not an unprimeable number, because it can be changed into a prime (72644863) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83453 + ... + 84318.

It is an arithmetic number, because the mean of its divisors is an integer number (18203262).

Almost surely, 2^72644843 is an apocalyptic number.

72644843 is a deficient number, since it is larger than the sum of its proper divisors (168205).

72644843 is a wasteful number, since it uses less digits than its factorization.

72644843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168204.

The product of its digits is 129024, while the sum is 38.

The square root of 72644843 is about 8523.1944128947. The cubic root of 72644843 is about 417.2550450927.

The spelling of 72644843 in words is "seventy-two million, six hundred forty-four thousand, eight hundred forty-three".