87821411 has 4 divisors (see below), whose sum is σ = 87840312. Its totient is φ = 87802512.

The previous prime is 87821407. The next prime is 87821413. The reversal of 87821411 is 11412878.

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 87821411 - 2² = 87821407 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87821413) 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, 2900 + ... + 13566.

It is an arithmetic number, because the mean of its divisors is an integer number (21960078).

Almost surely, 2^87821411 is an apocalyptic number.

87821411 is a deficient number, since it is larger than the sum of its proper divisors (18901).

87821411 is a wasteful number, since it uses less digits than its factorization.

87821411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18900.

The product of its digits is 3584, while the sum is 32.

The square root of 87821411 is about 9371.3078596320. The cubic root of 87821411 is about 444.4949216257.

The spelling of 87821411 in words is "eighty-seven million, eight hundred twenty-one thousand, four hundred eleven".