84521660 has 48 divisors (see below), whose sum is σ = 187941600. Its totient is φ = 31874304.

The previous prime is 84521659. The next prime is 84521677. The reversal of 84521660 is 6612548.

It is a super-2 number, since 2×84521660² = 14287822018311200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23246 + ... + 26634.

It is an arithmetic number, because the mean of its divisors is an integer number (3915450).

Almost surely, 2^84521660 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 84521660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93970800).

84521660 is an abundant number, since it is smaller than the sum of its proper divisors (103419940).

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

84521660 is a wasteful number, since it uses less digits than its factorization.

84521660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3470 (or 3468 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 84521660 is about 9193.5662286188. The cubic root of 84521660 is about 438.8566389330.

The spelling of 84521660 in words is "eighty-four million, five hundred twenty-one thousand, six hundred sixty".