72228979 has 2 divisors, whose sum is σ = 72228980. Its totient is φ = 72228978.

The previous prime is 72228973. The next prime is 72228997. The reversal of 72228979 is 97982227.

Together with next prime (72228997) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 72228979 - 2⁷ = 72228851 is a prime.

It is not a weakly prime, because it can be changed into another prime (72228973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36114489 + 36114490.

It is an arithmetic number, because the mean of its divisors is an integer number (36114490).

Almost surely, 2^72228979 is an apocalyptic number.

72228979 is a deficient number, since it is larger than the sum of its proper divisors (1).

72228979 is an equidigital number, since it uses as much as digits as its factorization.

72228979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 254016, while the sum is 46.

The square root of 72228979 is about 8498.7633806337. The cubic root of 72228979 is about 416.4573122852.

The spelling of 72228979 in words is "seventy-two million, two hundred twenty-eight thousand, nine hundred seventy-nine".