72055889 has 2 divisors, whose sum is σ = 72055890. Its totient is φ = 72055888.

The previous prime is 72055787. The next prime is 72055927. The reversal of 72055889 is 98855027.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70845889 + 1210000 = 8417^2 + 1100^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72055889 is a prime.

It is a super-2 number, since 2×72055889² = 10384102279160642, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (72055589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36027944 + 36027945.

It is an arithmetic number, because the mean of its divisors is an integer number (36027945).

Almost surely, 2^72055889 is an apocalyptic number.

It is an amenable number.

72055889 is a deficient number, since it is larger than the sum of its proper divisors (1).

72055889 is an equidigital number, since it uses as much as digits as its factorization.

72055889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 201600, while the sum is 44.

The square root of 72055889 is about 8488.5740263015. The cubic root of 72055889 is about 416.1243791822.

The spelling of 72055889 in words is "seventy-two million, fifty-five thousand, eight hundred eighty-nine".