72055643 has 4 divisors (see below), whose sum is σ = 78606168. Its totient is φ = 65505120.

The previous prime is 72055631. The next prime is 72055661. The reversal of 72055643 is 34655027.

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 72055643 - 2⁸ = 72055387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72055603) 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, 3275246 + ... + 3275267.

It is an arithmetic number, because the mean of its divisors is an integer number (19651542).

Almost surely, 2^72055643 is an apocalyptic number.

72055643 is a deficient number, since it is larger than the sum of its proper divisors (6550525).

72055643 is a wasteful number, since it uses less digits than its factorization.

72055643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6550524.

The product of its (nonzero) digits is 25200, while the sum is 32.

The square root of 72055643 is about 8488.5595362229. The cubic root of 72055643 is about 416.1239056299.

The spelling of 72055643 in words is "seventy-two million, fifty-five thousand, six hundred forty-three".