72239669 has 2 divisors, whose sum is σ = 72239670. Its totient is φ = 72239668.

The previous prime is 72239639. The next prime is 72239701. The reversal of 72239669 is 96693227.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66178225 + 6061444 = 8135^2 + 2462^2 .

It is a cyclic number.

It is not a de Polignac number, because 72239669 - 2¹² = 72235573 is a prime.

It is a super-2 number, since 2×72239669² = 10437139554459122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72239639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36119834 + 36119835.

It is an arithmetic number, because the mean of its divisors is an integer number (36119835).

Almost surely, 2^72239669 is an apocalyptic number.

It is an amenable number.

72239669 is a deficient number, since it is larger than the sum of its proper divisors (1).

72239669 is an equidigital number, since it uses as much as digits as its factorization.

72239669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 244944, while the sum is 44.

The square root of 72239669 is about 8499.3922723922. The cubic root of 72239669 is about 416.4778567126.

The spelling of 72239669 in words is "seventy-two million, two hundred thirty-nine thousand, six hundred sixty-nine".