87089999 has 4 divisors (see below), whose sum is σ = 87611664. Its totient is φ = 86568336.

The previous prime is 87089993. The next prime is 87090001. The reversal of 87089999 is 99998078.

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 87089999 - 2¹² = 87085903 is a prime.

It is a Duffinian number.

87089999 is a modest number, since divided by 9999 gives 8708 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87089993) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 260582 + ... + 260915.

It is an arithmetic number, because the mean of its divisors is an integer number (21902916).

Almost surely, 2^87089999 is an apocalyptic number.

87089999 is a deficient number, since it is larger than the sum of its proper divisors (521665).

87089999 is a wasteful number, since it uses less digits than its factorization.

87089999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 521664.

The product of its (nonzero) digits is 2939328, while the sum is 59.

The square root of 87089999 is about 9332.2022588454. The cubic root of 87089999 is about 443.2575025608.

It can be divided in two parts, 87089 and 999, that added together give a palindrome (88088).

The spelling of 87089999 in words is "eighty-seven million, eighty-nine thousand, nine hundred ninety-nine".