72215999 has 2 divisors, whose sum is σ = 72216000. Its totient is φ = 72215998.

The previous prime is 72215993. The next prime is 72216013. The reversal of 72215999 is 99951227.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72215999 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72215993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36107999 + 36108000.

It is an arithmetic number, because the mean of its divisors is an integer number (36108000).

Almost surely, 2^72215999 is an apocalyptic number.

72215999 is a deficient number, since it is larger than the sum of its proper divisors (1).

72215999 is an equidigital number, since it uses as much as digits as its factorization.

72215999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 102060, while the sum is 44.

The square root of 72215999 is about 8497.9997058131. Note that the first 3 decimals coincide. The cubic root of 72215999 is about 416.4323641280.

The spelling of 72215999 in words is "seventy-two million, two hundred fifteen thousand, nine hundred ninety-nine".