87403221 has 12 divisors (see below), whose sum is σ = 128935872. Its totient is φ = 57028776.

The previous prime is 87403189. The next prime is 87403231. The reversal of 87403221 is 12230478.

It is not a de Polignac number, because 87403221 - 2⁵ = 87403189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87403231) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 102891 + ... + 103736.

It is an arithmetic number, because the mean of its divisors is an integer number (10744656).

Almost surely, 2^87403221 is an apocalyptic number.

It is an amenable number.

87403221 is a deficient number, since it is larger than the sum of its proper divisors (41532651).

87403221 is a wasteful number, since it uses less digits than its factorization.

87403221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206680 (or 206677 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 87403221 is about 9348.9689805882. The cubic root of 87403221 is about 443.7882634201.

Adding to 87403221 its reverse (12230478), we get a palindrome (99633699).

The spelling of 87403221 in words is "eighty-seven million, four hundred three thousand, two hundred twenty-one".