82721160 has 48 divisors (see below), whose sum is σ = 268844940. Its totient is φ = 22058880.

The previous prime is 82721141. The next prime is 82721227. The reversal of 82721160 is 6112728.

It can be written as a sum of positive squares in 2 ways, for example, as 78535044 + 4186116 = 8862^2 + 2046^2 .

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 114531 + ... + 115250.

Almost surely, 2^82721160 is an apocalyptic number.

It is an amenable number.

82721160 is an abundant number, since it is smaller than the sum of its proper divisors (186123780).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

82721160 is a wasteful number, since it uses less digits than its factorization.

82721160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229798 (or 229791 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 82721160 is about 9095.1173714252. The cubic root of 82721160 is about 435.7180372593.

Adding to 82721160 its reverse (6112728), we get a palindrome (88833888).

The spelling of 82721160 in words is "eighty-two million, seven hundred twenty-one thousand, one hundred sixty".