72323989 has 2 divisors, whose sum is σ = 72323990. Its totient is φ = 72323988.

The previous prime is 72323987. The next prime is 72324037. The reversal of 72323989 is 98932327.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63520900 + 8803089 = 7970^2 + 2967^2 .

It is a cyclic number.

It is not a de Polignac number, because 72323989 - 2¹ = 72323987 is a prime.

Together with 72323987, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72323987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36161994 + 36161995.

It is an arithmetic number, because the mean of its divisors is an integer number (36161995).

Almost surely, 2^72323989 is an apocalyptic number.

It is an amenable number.

72323989 is a deficient number, since it is larger than the sum of its proper divisors (1).

72323989 is an equidigital number, since it uses as much as digits as its factorization.

72323989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 163296, while the sum is 43.

The square root of 72323989 is about 8504.3511804252. The cubic root of 72323989 is about 416.6398349300.

The spelling of 72323989 in words is "seventy-two million, three hundred twenty-three thousand, nine hundred eighty-nine".