84489720 has 96 divisors (see below), whose sum is σ = 294872400. Its totient is φ = 19310592.

The previous prime is 84489719. The next prime is 84489733. The reversal of 84489720 is 2798448.

It is a Harshad number since it is a multiple of its sum of digits (42).

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 23 ways as a sum of consecutive naturals, for example, 1305 + ... + 13064.

Almost surely, 2^84489720 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 84489720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (147436200).

84489720 is an abundant number, since it is smaller than the sum of its proper divisors (210382680).

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

84489720 is a wasteful number, since it uses less digits than its factorization.

84489720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14397 (or 14386 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 42.

The square root of 84489720 is about 9191.8289801323. The cubic root of 84489720 is about 438.8013519330.

The spelling of 84489720 in words is "eighty-four million, four hundred eighty-nine thousand, seven hundred twenty".