87999999 has 4 divisors (see below), whose sum is σ = 117333336. Its totient is φ = 58666664.

The previous prime is 87999997. The next prime is 88000009. The reversal of 87999999 is 99999978.

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

It is a cyclic number.

It is not a de Polignac number, because 87999999 - 2¹ = 87999997 is a prime.

87999999 is a modest number, since divided by 9999 gives 8799 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87999997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14666664 + ... + 14666669.

It is an arithmetic number, because the mean of its divisors is an integer number (29333334).

Almost surely, 2^87999999 is an apocalyptic number.

87999999 is a deficient number, since it is larger than the sum of its proper divisors (29333337).

87999999 is a wasteful number, since it uses less digits than its factorization.

87999999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29333336.

The product of its digits is 29760696, while the sum is 69.

The square root of 87999999 is about 9380.8314663467. The cubic root of 87999999 is about 444.7960164290.

The spelling of 87999999 in words is "eighty-seven million, nine hundred ninety-nine thousand, nine hundred ninety-nine".