72745591 has 2 divisors, whose sum is σ = 72745592. Its totient is φ = 72745590.

The previous prime is 72745583. The next prime is 72745657. The reversal of 72745591 is 19554727.

It is a weak prime.

It is an emirp because it is prime and its reverse (19554727) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72745591 - 2³ = 72745583 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72745571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36372795 + 36372796.

It is an arithmetic number, because the mean of its divisors is an integer number (36372796).

Almost surely, 2^72745591 is an apocalyptic number.

72745591 is a deficient number, since it is larger than the sum of its proper divisors (1).

72745591 is an equidigital number, since it uses as much as digits as its factorization.

72745591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 88200, while the sum is 40.

The square root of 72745591 is about 8529.1025905426. The cubic root of 72745591 is about 417.4478470000.

The spelling of 72745591 in words is "seventy-two million, seven hundred forty-five thousand, five hundred ninety-one".