87188993 has 12 divisors (see below), whose sum is σ = 92437488. Its totient is φ = 82190640.

The previous prime is 87188953. The next prime is 87188999. The reversal of 87188993 is 39988178.

It is not a de Polignac number, because 87188993 - 2⁸ = 87188737 is a prime.

It is a Duffinian 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 11 ways as a sum of consecutive naturals, for example, 34958 + ... + 37368.

It is an arithmetic number, because the mean of its divisors is an integer number (7703124).

Almost surely, 2^87188993 is an apocalyptic number.

It is an amenable number.

87188993 is a deficient number, since it is larger than the sum of its proper divisors (5248495).

87188993 is a wasteful number, since it uses less digits than its factorization.

87188993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2512 (or 2483 counting only the distinct ones).

The product of its digits is 870912, while the sum is 53.

The square root of 87188993 is about 9337.5046452465. The cubic root of 87188993 is about 443.4253871948.

The spelling of 87188993 in words is "eighty-seven million, one hundred eighty-eight thousand, nine hundred ninety-three".