72220123 has 2 divisors, whose sum is σ = 72220124. Its totient is φ = 72220122.

The previous prime is 72220117. The next prime is 72220217. The reversal of 72220123 is 32102227.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 72220123 - 2⁹ = 72219611 is a prime.

It is a super-2 number, since 2×72220123² = 10431492332270258, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 72220123.

It is not a weakly prime, because it can be changed into another prime (72220723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36110061 + 36110062.

It is an arithmetic number, because the mean of its divisors is an integer number (36110062).

Almost surely, 2^72220123 is an apocalyptic number.

72220123 is a deficient number, since it is larger than the sum of its proper divisors (1).

72220123 is an equidigital number, since it uses as much as digits as its factorization.

72220123 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 336, while the sum is 19.

The square root of 72220123 is about 8498.2423476858. The cubic root of 72220123 is about 416.4402909698.

The spelling of 72220123 in words is "seventy-two million, two hundred twenty thousand, one hundred twenty-three".