82720140 has 24 divisors (see below), whose sum is σ = 231616560. Its totient is φ = 22058688.

The previous prime is 82720097. The next prime is 82720153. The reversal of 82720140 is 4102728.

It is a self number, because there is not a number n which added to its sum of digits gives 82720140.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 689275 + ... + 689394.

It is an arithmetic number, because the mean of its divisors is an integer number (9650690).

Almost surely, 2^82720140 is an apocalyptic number.

It is an amenable number.

82720140 is an abundant number, since it is smaller than the sum of its proper divisors (148896420).

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

82720140 is a wasteful number, since it uses less digits than its factorization.

82720140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1378681 (or 1378679 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 24.

The square root of 82720140 is about 9095.0612972096. The cubic root of 82720140 is about 435.7162463663.

Adding to 82720140 its reverse (4102728), we get a palindrome (86822868).

The spelling of 82720140 in words is "eighty-two million, seven hundred twenty thousand, one hundred forty".