82261720 has 32 divisors (see below), whose sum is σ = 186282000. Its totient is φ = 32692608.

The previous prime is 82261717. The next prime is 82261727. The reversal of 82261720 is 2716228.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82261727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 270 + ... + 12829.

Almost surely, 2^82261720 is an apocalyptic number.

It is an amenable number.

82261720 is an abundant number, since it is smaller than the sum of its proper divisors (104020280).

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

82261720 is a wasteful number, since it uses less digits than its factorization.

82261720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13267 (or 13263 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 82261720 is about 9069.8246951085. The cubic root of 82261720 is about 434.9098681450.

Adding to 82261720 its reverse (2716228), we get a palindrome (84977948).

The spelling of 82261720 in words is "eighty-two million, two hundred sixty-one thousand, seven hundred twenty".