87922821 has 8 divisors (see below), whose sum is σ = 133977664. Its totient is φ = 50241600.

The previous prime is 87922817. The next prime is 87922843. The reversal of 87922821 is 12822978.

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

It is not a de Polignac number, because 87922821 - 2² = 87922817 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 87922821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87922811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2093380 + ... + 2093421.

It is an arithmetic number, because the mean of its divisors is an integer number (16747208).

Almost surely, 2^87922821 is an apocalyptic number.

It is an amenable number.

87922821 is a deficient number, since it is larger than the sum of its proper divisors (46054843).

87922821 is a wasteful number, since it uses less digits than its factorization.

87922821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4186811.

The product of its digits is 32256, while the sum is 39.

The square root of 87922821 is about 9376.7169627754. The cubic root of 87922821 is about 444.6659463235.

The spelling of 87922821 in words is "eighty-seven million, nine hundred twenty-two thousand, eight hundred twenty-one".