84711220 has 48 divisors (see below), whose sum is σ = 200342016. Its totient is φ = 29808000.

The previous prime is 84711191. The next prime is 84711223. The reversal of 84711220 is 2211748.

It is a happy number.

It is a Smith number, since the sum of its digits (25) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84711223) 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, 610 + ... + 13030.

It is an arithmetic number, because the mean of its divisors is an integer number (4173792).

Almost surely, 2^84711220 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 84711220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100171008).

84711220 is an abundant number, since it is smaller than the sum of its proper divisors (115630796).

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

84711220 is a wasteful number, since it uses less digits than its factorization.

84711220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12472 (or 12470 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 84711220 is about 9203.8698382800. The cubic root of 84711220 is about 439.1844742317.

Adding to 84711220 its reverse (2211748), we get a palindrome (86922968).

The spelling of 84711220 in words is "eighty-four million, seven hundred eleven thousand, two hundred twenty".