72865563 has 4 divisors (see below), whose sum is σ = 97154088. Its totient is φ = 48577040.

The previous prime is 72865547. The next prime is 72865577. The reversal of 72865563 is 36556827.

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 72865563 - 2⁴ = 72865547 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72865523) 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, 12144258 + ... + 12144263.

It is an arithmetic number, because the mean of its divisors is an integer number (24288522).

Almost surely, 2^72865563 is an apocalyptic number.

72865563 is a deficient number, since it is larger than the sum of its proper divisors (24288525).

72865563 is a wasteful number, since it uses less digits than its factorization.

72865563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24288524.

The product of its digits is 302400, while the sum is 42.

The square root of 72865563 is about 8536.1327895013. The cubic root of 72865563 is about 417.6772059015.

The spelling of 72865563 in words is "seventy-two million, eight hundred sixty-five thousand, five hundred sixty-three".