72896591 has 4 divisors (see below), whose sum is σ = 76066032. Its totient is φ = 69727152.

The previous prime is 72896581. The next prime is 72896599. The reversal of 72896591 is 19569827.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72896591 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72896599) 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 in 3 ways as a sum of consecutive naturals, for example, 1584686 + ... + 1584731.

It is an arithmetic number, because the mean of its divisors is an integer number (19016508).

Almost surely, 2^72896591 is an apocalyptic number.

72896591 is a deficient number, since it is larger than the sum of its proper divisors (3169441).

72896591 is a wasteful number, since it uses less digits than its factorization.

72896591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3169440.

The product of its digits is 272160, while the sum is 47.

The square root of 72896591 is about 8537.9500467032. The cubic root of 72896591 is about 417.7364833284.

The spelling of 72896591 in words is "seventy-two million, eight hundred ninety-six thousand, five hundred ninety-one".