87999903 has 12 divisors (see below), whose sum is σ = 128300328. Its totient is φ = 58117680.

The previous prime is 87999883. The next prime is 87999929. The reversal of 87999903 is 30999978.

It is a happy number.

It is not a de Polignac number, because 87999903 - 2⁸ = 87999647 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 87999903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87999953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 44728 + ... + 46653.

It is an arithmetic number, because the mean of its divisors is an integer number (10691694).

Almost surely, 2^87999903 is an apocalyptic number.

87999903 is a deficient number, since it is larger than the sum of its proper divisors (40300425).

87999903 is a wasteful number, since it uses less digits than its factorization.

87999903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91494 (or 91491 counting only the distinct ones).

The product of its (nonzero) digits is 1102248, while the sum is 54.

The square root of 87999903 is about 9380.8263495281. The cubic root of 87999903 is about 444.7958546850.

The spelling of 87999903 in words is "eighty-seven million, nine hundred ninety-nine thousand, nine hundred three".