72245669 has 2 divisors, whose sum is σ = 72245670. Its totient is φ = 72245668.

The previous prime is 72245647. The next prime is 72245687. The reversal of 72245669 is 96654227.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53436100 + 18809569 = 7310^2 + 4337^2 .

It is an emirp because it is prime and its reverse (96654227) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72245669 is a prime.

It is a super-2 number, since 2×72245669² = 10438873378515122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72245629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36122834 + 36122835.

It is an arithmetic number, because the mean of its divisors is an integer number (36122835).

Almost surely, 2^72245669 is an apocalyptic number.

It is an amenable number.

72245669 is a deficient number, since it is larger than the sum of its proper divisors (1).

72245669 is an equidigital number, since it uses as much as digits as its factorization.

72245669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 181440, while the sum is 41.

The square root of 72245669 is about 8499.7452314761. The cubic root of 72245669 is about 416.4893868409.

The spelling of 72245669 in words is "seventy-two million, two hundred forty-five thousand, six hundred sixty-nine".