82720161 has 12 divisors (see below), whose sum is σ = 119804880. Its totient is φ = 54999000.

The previous prime is 82720153. The next prime is 82720171. The reversal of 82720161 is 16102728.

It is not a de Polignac number, because 82720161 - 2³ = 82720153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (82720171) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8715 + ... + 15536.

It is an arithmetic number, because the mean of its divisors is an integer number (9983740).

Almost surely, 2^82720161 is an apocalyptic number.

It is an amenable number.

82720161 is a deficient number, since it is larger than the sum of its proper divisors (37084719).

82720161 is a wasteful number, since it uses less digits than its factorization.

82720161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24636 (or 24633 counting only the distinct ones).

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

The square root of 82720161 is about 9095.0624516822. The cubic root of 82720161 is about 435.7162832378.

Adding to 82720161 its reverse (16102728), we get a palindrome (98822889).

The spelling of 82720161 in words is "eighty-two million, seven hundred twenty thousand, one hundred sixty-one".