72633643 has 4 divisors (see below), whose sum is σ = 73338928. Its totient is φ = 71928360.

The previous prime is 72633629. The next prime is 72633667. The reversal of 72633643 is 34633627.

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 72633643 - 2⁵ = 72633611 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 72633599 and 72633608.

It is not an unprimeable number, because it can be changed into a prime (72633623) 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, 352488 + ... + 352693.

It is an arithmetic number, because the mean of its divisors is an integer number (18334732).

Almost surely, 2^72633643 is an apocalyptic number.

72633643 is a deficient number, since it is larger than the sum of its proper divisors (705285).

72633643 is a wasteful number, since it uses less digits than its factorization.

72633643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 705284.

The product of its digits is 54432, while the sum is 34.

The square root of 72633643 is about 8522.5373569143. The cubic root of 72633643 is about 417.2336005941.

The spelling of 72633643 in words is "seventy-two million, six hundred thirty-three thousand, six hundred forty-three".