72435991 has 2 divisors, whose sum is σ = 72435992. Its totient is φ = 72435990.

The previous prime is 72435967. The next prime is 72436061. The reversal of 72435991 is 19953427.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 72435991 - 2⁵ = 72435959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72435941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36217995 + 36217996.

It is an arithmetic number, because the mean of its divisors is an integer number (36217996).

Almost surely, 2^72435991 is an apocalyptic number.

72435991 is a deficient number, since it is larger than the sum of its proper divisors (1).

72435991 is an equidigital number, since it uses as much as digits as its factorization.

72435991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 68040, while the sum is 40.

The square root of 72435991 is about 8510.9336150625. The cubic root of 72435991 is about 416.8547955431.

The spelling of 72435991 in words is "seventy-two million, four hundred thirty-five thousand, nine hundred ninety-one".