82420812 has 18 divisors (see below), whose sum is σ = 208341588. Its totient is φ = 27473592.

The previous prime is 82420771. The next prime is 82420829. The reversal of 82420812 is 21802428.

It is a tau number, because it is divible by the number of its divisors (18).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1144698 + ... + 1144769.

Almost surely, 2^82420812 is an apocalyptic number.

It is an amenable number.

82420812 is an abundant number, since it is smaller than the sum of its proper divisors (125920776).

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

82420812 is a wasteful number, since it uses less digits than its factorization.

82420812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2289477 (or 2289472 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 27.

The square root of 82420812 is about 9078.5908598196. The cubic root of 82420812 is about 435.1900556745.

The spelling of 82420812 in words is "eighty-two million, four hundred twenty thousand, eight hundred twelve".