82421872 has 20 divisors (see below), whose sum is σ = 171976840. Its totient is φ = 38040768.

The previous prime is 82421863. The next prime is 82421881. The reversal of 82421872 is 27812428.

It is an interprime number because it is at equal distance from previous prime (82421863) and next prime (82421881).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 197922 + ... + 198337.

It is an arithmetic number, because the mean of its divisors is an integer number (8598842).

Almost surely, 2^82421872 is an apocalyptic number.

It is an amenable number.

82421872 is an abundant number, since it is smaller than the sum of its proper divisors (89554968).

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

82421872 is a wasteful number, since it uses less digits than its factorization.

82421872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 396280 (or 396274 counting only the distinct ones).

The product of its digits is 14336, while the sum is 34.

The square root of 82421872 is about 9078.6492387359. The cubic root of 82421872 is about 435.1919213015.

The spelling of 82421872 in words is "eighty-two million, four hundred twenty-one thousand, eight hundred seventy-two".