82921670 has 32 divisors (see below), whose sum is σ = 167735232. Its totient is φ = 29284992.

The previous prime is 82921669. The next prime is 82921687. The reversal of 82921670 is 7612928.

It is a happy number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 82921670.

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, 10877 + ... + 16856.

It is an arithmetic number, because the mean of its divisors is an integer number (5241726).

Almost surely, 2^82921670 is an apocalyptic number.

82921670 is an abundant number, since it is smaller than the sum of its proper divisors (84813562).

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

82921670 is a wasteful number, since it uses less digits than its factorization.

82921670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27776.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 82921670 is about 9106.1336471633. The cubic root of 82921670 is about 436.0698026726.

The spelling of 82921670 in words is "eighty-two million, nine hundred twenty-one thousand, six hundred seventy".