72432991 has 2 divisors, whose sum is σ = 72432992. Its totient is φ = 72432990.

The previous prime is 72432989. The next prime is 72433037. The reversal of 72432991 is 19923427.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 72432991 - 2¹ = 72432989 is a prime.

Together with 72432989, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 72432991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72432961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36216495 + 36216496.

It is an arithmetic number, because the mean of its divisors is an integer number (36216496).

Almost surely, 2^72432991 is an apocalyptic number.

72432991 is a deficient number, since it is larger than the sum of its proper divisors (1).

72432991 is an equidigital number, since it uses as much as digits as its factorization.

72432991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27216, while the sum is 37.

The square root of 72432991 is about 8510.7573693532. The cubic root of 72432991 is about 416.8490406615.

The spelling of 72432991 in words is "seventy-two million, four hundred thirty-two thousand, nine hundred ninety-one".