82440091 has 4 divisors (see below), whose sum is σ = 82508400. Its totient is φ = 82371784.

The previous prime is 82440047. The next prime is 82440101. The reversal of 82440091 is 19004428.

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

It is a cyclic number.

It is not a de Polignac number, because 82440091 - 2¹⁵ = 82407323 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82440691) 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, 32311 + ... + 34768.

It is an arithmetic number, because the mean of its divisors is an integer number (20627100).

Almost surely, 2^82440091 is an apocalyptic number.

82440091 is a deficient number, since it is larger than the sum of its proper divisors (68309).

82440091 is a wasteful number, since it uses less digits than its factorization.

82440091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68308.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 82440091 is about 9079.6525814593. The cubic root of 82440091 is about 435.2239847061.

The spelling of 82440091 in words is "eighty-two million, four hundred forty thousand, ninety-one".