72259991 has 2 divisors, whose sum is σ = 72259992. Its totient is φ = 72259990.

The previous prime is 72259987. The next prime is 72260003. The reversal of 72259991 is 19995227.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 72259991 - 2² = 72259987 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72259921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36129995 + 36129996.

It is an arithmetic number, because the mean of its divisors is an integer number (36129996).

Almost surely, 2^72259991 is an apocalyptic number.

72259991 is a deficient number, since it is larger than the sum of its proper divisors (1).

72259991 is an equidigital number, since it uses as much as digits as its factorization.

72259991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 102060, while the sum is 44.

The square root of 72259991 is about 8500.5876855662. The cubic root of 72259991 is about 416.5169066769.

The spelling of 72259991 in words is "seventy-two million, two hundred fifty-nine thousand, nine hundred ninety-one".