12087558 has 96 divisors (see below), whose sum is σ = 32288256. Its totient is φ = 3193344.

The previous prime is 12087547. The next prime is 12087571. The reversal of 12087558 is 85578021.

12087558 is a `hidden beast` number, since 1 + 20 + 87 + 558 = 666.

It is a super-2 number, since 2×12087558² = 292218116806728, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 124566 + ... + 124662.

It is an arithmetic number, because the mean of its divisors is an integer number (336336).

Almost surely, 2^12087558 is an apocalyptic number.

12087558 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 12087558, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16144128).

12087558 is an abundant number, since it is smaller than the sum of its proper divisors (20200698).

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

12087558 is a wasteful number, since it uses less digits than its factorization.

12087558 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178 (or 175 counting only the distinct ones).

The product of its (nonzero) digits is 22400, while the sum is 36.

The square root of 12087558 is about 3476.7165544519. The cubic root of 12087558 is about 229.4983268421.

It can be divided in two parts, 120 and 87558, that added together give a palindrome (87678).

The spelling of 12087558 in words is "twelve million, eighty-seven thousand, five hundred fifty-eight".