87823021 has 8 divisors (see below), whose sum is σ = 103176864. Its totient is φ = 73697520.

The previous prime is 87823013. The next prime is 87823027. The reversal of 87823021 is 12032878.

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

It is not a de Polignac number, because 87823021 - 2³ = 87823013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87823027) 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, 306931 + ... + 307216.

It is an arithmetic number, because the mean of its divisors is an integer number (12897108).

Almost surely, 2^87823021 is an apocalyptic number.

It is an amenable number.

87823021 is a deficient number, since it is larger than the sum of its proper divisors (15353843).

87823021 is a wasteful number, since it uses less digits than its factorization.

87823021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 614171.

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 87823021 is about 9371.3937597350. The cubic root of 87823021 is about 444.4976378671.

Adding to 87823021 its reverse (12032878), we get a palindrome (99855899).

The spelling of 87823021 in words is "eighty-seven million, eight hundred twenty-three thousand, twenty-one".