72280891 has 2 divisors, whose sum is σ = 72280892. Its totient is φ = 72280890.

The previous prime is 72280867. The next prime is 72280903. The reversal of 72280891 is 19808227.

It is a strong prime.

It is an emirp because it is prime and its reverse (19808227) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72280891 - 2¹⁹ = 71756603 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 72280891.

It is not a weakly prime, because it can be changed into another prime (72280391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36140445 + 36140446.

It is an arithmetic number, because the mean of its divisors is an integer number (36140446).

Almost surely, 2^72280891 is an apocalyptic number.

72280891 is a deficient number, since it is larger than the sum of its proper divisors (1).

72280891 is an equidigital number, since it uses as much as digits as its factorization.

72280891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 72280891 is about 8501.8169234582. The cubic root of 72280891 is about 416.5570596674.

The spelling of 72280891 in words is "seventy-two million, two hundred eighty thousand, eight hundred ninety-one".