87821499 has 8 divisors (see below), whose sum is σ = 117164880. Its totient is φ = 58512896.

The previous prime is 87821491. The next prime is 87821509. The reversal of 87821499 is 99412878.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 87821499 - 2³ = 87821491 is a prime.

It is not an unprimeable number, because it can be changed into a prime (87821491) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2082 + ... + 13415.

It is an arithmetic number, because the mean of its divisors is an integer number (14645610).

Almost surely, 2^87821499 is an apocalyptic number.

87821499 is a deficient number, since it is larger than the sum of its proper divisors (29343381).

87821499 is a wasteful number, since it uses less digits than its factorization.

87821499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17389.

The product of its digits is 290304, while the sum is 48.

The square root of 87821499 is about 9371.3125548132. The cubic root of 87821499 is about 444.4950700919.

The spelling of 87821499 in words is "eighty-seven million, eight hundred twenty-one thousand, four hundred ninety-nine".