82091649 has 8 divisors (see below), whose sum is σ = 109666912. Its totient is φ = 54622080.

The previous prime is 82091629. The next prime is 82091651. The reversal of 82091649 is 94619028.

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

It is not a de Polignac number, because 82091649 - 2¹³ = 82083457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82091629) 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, 24592 + ... + 27729.

It is an arithmetic number, because the mean of its divisors is an integer number (13708364).

Almost surely, 2^82091649 is an apocalyptic number.

It is an amenable number.

82091649 is a deficient number, since it is larger than the sum of its proper divisors (27575263).

82091649 is a wasteful number, since it uses less digits than its factorization.

82091649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52847.

The product of its (nonzero) digits is 31104, while the sum is 39.

The square root of 82091649 is about 9060.4441944090. Note that the first 3 decimals coincide. The cubic root of 82091649 is about 434.6099449735.

The spelling of 82091649 in words is "eighty-two million, ninety-one thousand, six hundred forty-nine".