85222720 has 168 divisors, whose sum is σ = 233501184. Its totient is φ = 29568000.

The previous prime is 85222699. The next prime is 85222721. The reversal of 85222720 is 2722258.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85222721) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1200285 + ... + 1200355.

It is an arithmetic number, because the mean of its divisors is an integer number (1389888).

Almost surely, 2^85222720 is an apocalyptic number.

85222720 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 85222720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (116750592).

85222720 is an abundant number, since it is smaller than the sum of its proper divisors (148278464).

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

85222720 is a wasteful number, since it uses less digits than its factorization.

85222720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141 (or 120 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 28.

The square root of 85222720 is about 9231.6152432822. The cubic root of 85222720 is about 440.0666565682.

Adding to 85222720 its reverse (2722258), we get a palindrome (87944978).

The spelling of 85222720 in words is "eighty-five million, two hundred twenty-two thousand, seven hundred twenty".