87999823 has 2 divisors, whose sum is σ = 87999824. Its totient is φ = 87999822.

The previous prime is 87999781. The next prime is 87999827. The reversal of 87999823 is 32899978.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 87999823 - 2¹⁷ = 87868751 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87999827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43999911 + 43999912.

It is an arithmetic number, because the mean of its divisors is an integer number (43999912).

Almost surely, 2^87999823 is an apocalyptic number.

87999823 is a deficient number, since it is larger than the sum of its proper divisors (1).

87999823 is an equidigital number, since it uses as much as digits as its factorization.

87999823 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1959552, while the sum is 55.

The square root of 87999823 is about 9380.8220855104. The cubic root of 87999823 is about 444.7957198982.

The spelling of 87999823 in words is "eighty-seven million, nine hundred ninety-nine thousand, eight hundred twenty-three".