72199643 has 2 divisors, whose sum is σ = 72199644. Its totient is φ = 72199642.

The previous prime is 72199637. The next prime is 72199667. The reversal of 72199643 is 34699127.

It is a weak prime.

It is an emirp because it is prime and its reverse (34699127) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72199643 - 2⁶ = 72199579 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 72199643.

It is not a weakly prime, because it can be changed into another prime (72199613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36099821 + 36099822.

It is an arithmetic number, because the mean of its divisors is an integer number (36099822).

Almost surely, 2^72199643 is an apocalyptic number.

72199643 is a deficient number, since it is larger than the sum of its proper divisors (1).

72199643 is an equidigital number, since it uses as much as digits as its factorization.

72199643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81648, while the sum is 41.

The square root of 72199643 is about 8497.0373072030. The cubic root of 72199643 is about 416.4009228864.

The spelling of 72199643 in words is "seventy-two million, one hundred ninety-nine thousand, six hundred forty-three".