82215420 has 48 divisors (see below), whose sum is σ = 263090688. Its totient is φ = 18792000.

The previous prime is 82215403. The next prime is 82215431. The reversal of 82215420 is 2451228.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 97456 + ... + 98295.

It is an arithmetic number, because the mean of its divisors is an integer number (5481056).

Almost surely, 2^82215420 is an apocalyptic number.

It is an amenable number.

82215420 is an abundant number, since it is smaller than the sum of its proper divisors (180875268).

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

82215420 is a wasteful number, since it uses less digits than its factorization.

82215420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195770 (or 195768 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 24.

The square root of 82215420 is about 9067.2719160727. The cubic root of 82215420 is about 434.8282582707.

Adding to 82215420 its reverse (2451228), we get a palindrome (84666648).

The spelling of 82215420 in words is "eighty-two million, two hundred fifteen thousand, four hundred twenty".