87243220 has 24 divisors (see below), whose sum is σ = 183431808. Its totient is φ = 34855200.

The previous prime is 87243217. The next prime is 87243227. The reversal of 87243220 is 2234278.

It is a super-2 number, since 2×87243220² = 15222758871936800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87243227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18505 + ... + 22735.

It is an arithmetic number, because the mean of its divisors is an integer number (7642992).

Almost surely, 2^87243220 is an apocalyptic number.

It is an amenable number.

87243220 is an abundant number, since it is smaller than the sum of its proper divisors (96188588).

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

87243220 is a wasteful number, since it uses less digits than its factorization.

87243220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5271 (or 5269 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 28.

The square root of 87243220 is about 9340.4079140046. The cubic root of 87243220 is about 443.5172972870.

Adding to 87243220 its reverse (2234278), we get a palindrome (89477498).

The spelling of 87243220 in words is "eighty-seven million, two hundred forty-three thousand, two hundred twenty".