87188990 has 16 divisors (see below), whose sum is σ = 179360352. Its totient is φ = 29893344.

The previous prime is 87188953. The next prime is 87188999. The reversal of 87188990 is 9988178.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87188999) 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, 622709 + ... + 622848.

It is an arithmetic number, because the mean of its divisors is an integer number (11210022).

Almost surely, 2^87188990 is an apocalyptic number.

87188990 is an abundant number, since it is smaller than the sum of its proper divisors (92171362).

87188990 is a wasteful number, since it uses less digits than its factorization.

87188990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1245571.

The product of its (nonzero) digits is 290304, while the sum is 50.

The square root of 87188990 is about 9337.5044846040. The cubic root of 87188990 is about 443.4253821091.

The spelling of 87188990 in words is "eighty-seven million, one hundred eighty-eight thousand, nine hundred ninety".