82729891 has 4 divisors (see below), whose sum is σ = 84965872. Its totient is φ = 80493912.

The previous prime is 82729883. The next prime is 82729901. The reversal of 82729891 is 19892728.

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 82729891 - 2³ = 82729883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82729831) 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, 1117935 + ... + 1118008.

It is an arithmetic number, because the mean of its divisors is an integer number (21241468).

Almost surely, 2^82729891 is an apocalyptic number.

82729891 is a deficient number, since it is larger than the sum of its proper divisors (2235981).

82729891 is a wasteful number, since it uses less digits than its factorization.

82729891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2235980.

The product of its digits is 145152, while the sum is 46.

The square root of 82729891 is about 9095.5973415714. The cubic root of 82729891 is about 435.7333663494.

The spelling of 82729891 in words is "eighty-two million, seven hundred twenty-nine thousand, eight hundred ninety-one".