72075209 has 2 divisors, whose sum is σ = 72075210. Its totient is φ = 72075208.

The previous prime is 72075203. The next prime is 72075229. The reversal of 72075209 is 90257027.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48260809 + 23814400 = 6947^2 + 4880^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72075209 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (72075203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36037604 + 36037605.

It is an arithmetic number, because the mean of its divisors is an integer number (36037605).

Almost surely, 2^72075209 is an apocalyptic number.

It is an amenable number.

72075209 is a deficient number, since it is larger than the sum of its proper divisors (1).

72075209 is an equidigital number, since it uses as much as digits as its factorization.

72075209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8820, while the sum is 32.

The square root of 72075209 is about 8489.7119503550. The cubic root of 72075209 is about 416.1615670036.

The spelling of 72075209 in words is "seventy-two million, seventy-five thousand, two hundred nine".