87605993 has 4 divisors (see below), whose sum is σ = 88590420. Its totient is φ = 86621568.

The previous prime is 87605957. The next prime is 87606041. The reversal of 87605993 is 39950678.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 34140649 + 53465344 = 5843^2 + 7312^2 .

It is a cyclic number.

It is not a de Polignac number, because 87605993 - 2¹⁴ = 87589609 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (87605923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 492080 + ... + 492257.

It is an arithmetic number, because the mean of its divisors is an integer number (22147605).

Almost surely, 2^87605993 is an apocalyptic number.

It is an amenable number.

87605993 is a deficient number, since it is larger than the sum of its proper divisors (984427).

87605993 is an equidigital number, since it uses as much as digits as its factorization.

87605993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 984426.

The product of its (nonzero) digits is 408240, while the sum is 47.

The square root of 87605993 is about 9359.8073163928. The cubic root of 87605993 is about 444.1311887451.

The spelling of 87605993 in words is "eighty-seven million, six hundred five thousand, nine hundred ninety-three".