85022720 has 144 divisors (see below), whose sum is σ = 224668080. Its totient is φ = 30818304.

The previous prime is 85022699. The next prime is 85022737. The reversal of 85022720 is 2722058.

It is a super-4 number, since 4×85022720⁴ (a number of 33 digits) contains 4444 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 85022720.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3696629 + ... + 3696651.

It is an arithmetic number, because the mean of its divisors is an integer number (1560195).

Almost surely, 2^85022720 is an apocalyptic number.

85022720 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 85022720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (112334040).

85022720 is an abundant number, since it is smaller than the sum of its proper divisors (139645360).

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

85022720 is a wasteful number, since it uses less digits than its factorization.

85022720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88 (or 49 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 26.

The square root of 85022720 is about 9220.7765399667. The cubic root of 85022720 is about 439.7221386162.

Adding to 85022720 its reverse (2722058), we get a palindrome (87744778).

The spelling of 85022720 in words is "eighty-five million, twenty-two thousand, seven hundred twenty".