82821912 has 64 divisors (see below), whose sum is σ = 225504000. Its totient is φ = 25248384.

The previous prime is 82821911. The next prime is 82821917. The reversal of 82821912 is 21912828.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82821911) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10093 + ... + 16355.

It is an arithmetic number, because the mean of its divisors is an integer number (3523500).

Almost surely, 2^82821912 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 82821912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (112752000).

82821912 is an abundant number, since it is smaller than the sum of its proper divisors (142682088).

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

82821912 is a wasteful number, since it uses less digits than its factorization.

82821912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6320 (or 6316 counting only the distinct ones).

The product of its digits is 4608, while the sum is 33.

The square root of 82821912 is about 9100.6544819590. The cubic root of 82821912 is about 435.8948628461.

The spelling of 82821912 in words is "eighty-two million, eight hundred twenty-one thousand, nine hundred twelve".