87771222 has 192 divisors, whose sum is σ = 260467200. Its totient is φ = 21384000.

The previous prime is 87771191. The next prime is 87771247. The reversal of 87771222 is 22217778.

It is a super-2 number, since 2×87771222² = 15407574822746568, 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 95 ways as a sum of consecutive naturals, for example, 868972 + ... + 869072.

It is an arithmetic number, because the mean of its divisors is an integer number (1356600).

Almost surely, 2^87771222 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 87771222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (130233600).

87771222 is an abundant number, since it is smaller than the sum of its proper divisors (172695978).

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

87771222 is a wasteful number, since it uses less digits than its factorization.

87771222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160 (or 143 counting only the distinct ones).

The product of its digits is 21952, while the sum is 36.

The square root of 87771222 is about 9368.6296756783. The cubic root of 87771222 is about 444.4102307876.

It can be divided in two parts, 8777 and 1222, that added together give a palindrome (9999).

The spelling of 87771222 in words is "eighty-seven million, seven hundred seventy-one thousand, two hundred twenty-two".