72621889 has 2 divisors, whose sum is σ = 72621890. Its totient is φ = 72621888.

The previous prime is 72621881. The next prime is 72621917. The reversal of 72621889 is 98812627.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38340864 + 34281025 = 6192^2 + 5855^2 .

It is an emirp because it is prime and its reverse (98812627) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72621889 - 2³ = 72621881 is a prime.

It is not a weakly prime, because it can be changed into another prime (72621881) 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, 36310944 + 36310945.

It is an arithmetic number, because the mean of its divisors is an integer number (36310945).

Almost surely, 2^72621889 is an apocalyptic number.

It is an amenable number.

72621889 is a deficient number, since it is larger than the sum of its proper divisors (1).

72621889 is an equidigital number, since it uses as much as digits as its factorization.

72621889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96768, while the sum is 43.

The square root of 72621889 is about 8521.8477456477. The cubic root of 72621889 is about 417.2110929879.

The spelling of 72621889 in words is "seventy-two million, six hundred twenty-one thousand, eight hundred eighty-nine".