87827821 has 8 divisors (see below), whose sum is σ = 89297600. Its totient is φ = 86362848.

The previous prime is 87827809. The next prime is 87827843. The reversal of 87827821 is 12872878.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87827821 is a prime.

It is a super-2 number, since 2×87827821² = 15427452283216082, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87827891) 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, 62080 + ... + 63478.

It is an arithmetic number, because the mean of its divisors is an integer number (11162200).

Almost surely, 2^87827821 is an apocalyptic number.

It is an amenable number.

87827821 is a deficient number, since it is larger than the sum of its proper divisors (1469779).

87827821 is a wasteful number, since it uses less digits than its factorization.

87827821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2403.

The product of its digits is 100352, while the sum is 43.

The square root of 87827821 is about 9371.6498547481. The cubic root of 87827821 is about 444.5057357810.

The spelling of 87827821 in words is "eighty-seven million, eight hundred twenty-seven thousand, eight hundred twenty-one".