87198993 has 24 divisors (see below), whose sum is σ = 145012608. Its totient is φ = 49459392.

The previous prime is 87198989. The next prime is 87198997. The reversal of 87198993 is 39989178.

It is an interprime number because it is at equal distance from previous prime (87198989) and next prime (87198997).

It is not a de Polignac number, because 87198993 - 2² = 87198989 is a prime.

It is not an unprimeable number, because it can be changed into a prime (87198997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3580 + ... + 13682.

It is an arithmetic number, because the mean of its divisors is an integer number (6042192).

Almost surely, 2^87198993 is an apocalyptic number.

It is an amenable number.

87198993 is a deficient number, since it is larger than the sum of its proper divisors (57813615).

87198993 is a wasteful number, since it uses less digits than its factorization.

87198993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10253 (or 10250 counting only the distinct ones).

The product of its digits is 979776, while the sum is 54.

The square root of 87198993 is about 9338.0401048614. The cubic root of 87198993 is about 443.4423391984.

The spelling of 87198993 in words is "eighty-seven million, one hundred ninety-eight thousand, nine hundred ninety-three".