86721593 has 8 divisors (see below), whose sum is σ = 99170688. Its totient is φ = 74287584.

The previous prime is 86721587. The next prime is 86721611. The reversal of 86721593 is 39512768.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 86721593 - 2⁴ = 86721577 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 86721593.

It is not an unprimeable number, because it can be changed into a prime (86721493) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14405 + ... + 19517.

It is an arithmetic number, because the mean of its divisors is an integer number (12396336).

Almost surely, 2^86721593 is an apocalyptic number.

It is an amenable number.

86721593 is a deficient number, since it is larger than the sum of its proper divisors (12449095).

86721593 is a wasteful number, since it uses less digits than its factorization.

86721593 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7543.

The product of its digits is 90720, while the sum is 41.

The square root of 86721593 is about 9312.4429125767. The cubic root of 86721593 is about 442.6316001273.

The spelling of 86721593 in words is "eighty-six million, seven hundred twenty-one thousand, five hundred ninety-three".