72244460857 has 4 divisors (see below), whose sum is σ = 72245002276. Its totient is φ = 72243919440.

The previous prime is 72244460851. The next prime is 72244460867. The reversal of 72244460857 is 75806444227.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 75806444227 = 14549 ⋅5210423.

It can be written as a sum of positive squares in 2 ways, for example, as 49399952121 + 22844508736 = 222261^2 + 151144^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72244460857 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 72244460857.

It is not an unprimeable number, because it can be changed into a prime (72244460851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87007 + ... + 389947.

It is an arithmetic number, because the mean of its divisors is an integer number (18061250569).

Almost surely, 2^72244460857 is an apocalyptic number.

It is an amenable number.

72244460857 is a deficient number, since it is larger than the sum of its proper divisors (541419).

72244460857 is a wasteful number, since it uses less digits than its factorization.

72244460857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 541418.

The product of its (nonzero) digits is 3010560, while the sum is 49.

The spelling of 72244460857 in words is "seventy-two billion, two hundred forty-four million, four hundred sixty thousand, eight hundred fifty-seven".