72215723 has 2 divisors, whose sum is σ = 72215724. Its totient is φ = 72215722.

The previous prime is 72215687. The next prime is 72215729. The reversal of 72215723 is 32751227.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 72215723 - 2⁶ = 72215659 is a prime.

It is a super-2 number, since 2×72215723² = 10430221296825458, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (72215729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36107861 + 36107862.

It is an arithmetic number, because the mean of its divisors is an integer number (36107862).

Almost surely, 2^72215723 is an apocalyptic number.

72215723 is a deficient number, since it is larger than the sum of its proper divisors (1).

72215723 is an equidigital number, since it uses as much as digits as its factorization.

72215723 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5880, while the sum is 29.

The square root of 72215723 is about 8497.9834666820. The cubic root of 72215723 is about 416.4318336109.

The spelling of 72215723 in words is "seventy-two million, two hundred fifteen thousand, seven hundred twenty-three".