82218620 has 24 divisors (see below), whose sum is σ = 188355888. Its totient is φ = 29897600.

The previous prime is 82218607. The next prime is 82218649. The reversal of 82218620 is 2681228.

It is a congruent number.

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, 186641 + ... + 187080.

It is an arithmetic number, because the mean of its divisors is an integer number (7848162).

Almost surely, 2^82218620 is an apocalyptic number.

It is an amenable number.

82218620 is an abundant number, since it is smaller than the sum of its proper divisors (106137268).

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

82218620 is a wasteful number, since it uses less digits than its factorization.

82218620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 373741 (or 373739 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 29.

The square root of 82218620 is about 9067.4483731643. The cubic root of 82218620 is about 434.8338996794.

Adding to 82218620 its reverse (2681228), we get a palindrome (84899848).

The spelling of 82218620 in words is "eighty-two million, two hundred eighteen thousand, six hundred twenty".