72845897 has 4 divisors (see below), whose sum is σ = 73843860. Its totient is φ = 71847936.

The previous prime is 72845893. The next prime is 72845909. The reversal of 72845897 is 79854827.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17774656 + 55071241 = 4216^2 + 7421^2 .

It is a cyclic number.

It is not a de Polignac number, because 72845897 - 2² = 72845893 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72845893) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 498872 + ... + 499017.

It is an arithmetic number, because the mean of its divisors is an integer number (18460965).

Almost surely, 2^72845897 is an apocalyptic number.

It is an amenable number.

72845897 is a deficient number, since it is larger than the sum of its proper divisors (997963).

72845897 is an equidigital number, since it uses as much as digits as its factorization.

72845897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 997962.

The product of its digits is 1128960, while the sum is 50.

The square root of 72845897 is about 8534.9807849813. The cubic root of 72845897 is about 417.6396262883.

The spelling of 72845897 in words is "seventy-two million, eight hundred forty-five thousand, eight hundred ninety-seven".