82720844 has 24 divisors (see below), whose sum is σ = 154722960. Its totient is φ = 38560256.

The previous prime is 82720837. The next prime is 82720849. The reversal of 82720844 is 44802728.

It is not an unprimeable number, because it can be changed into a prime (82720849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1592 + ... + 12960.

It is an arithmetic number, because the mean of its divisors is an integer number (6446790).

Almost surely, 2^82720844 is an apocalyptic number.

It is an amenable number.

82720844 is a deficient number, since it is larger than the sum of its proper divisors (72002116).

82720844 is a wasteful number, since it uses less digits than its factorization.

82720844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11497 (or 11495 counting only the distinct ones).

The product of its (nonzero) digits is 28672, while the sum is 35.

The square root of 82720844 is about 9095.0999994503. The cubic root of 82720844 is about 435.7174824352.

The spelling of 82720844 in words is "eighty-two million, seven hundred twenty thousand, eight hundred forty-four".