87321157 has 16 divisors (see below), whose sum is σ = 110927232. Its totient is φ = 66755520.

The previous prime is 87321151. The next prime is 87321161. The reversal of 87321157 is 75112378.

It is a cyclic number.

It is not a de Polignac number, because 87321157 - 2²³ = 78932549 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 (87321151) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6618 + ... + 14779.

It is an arithmetic number, because the mean of its divisors is an integer number (6932952).

Almost surely, 2^87321157 is an apocalyptic number.

It is an amenable number.

87321157 is a deficient number, since it is larger than the sum of its proper divisors (23606075).

87321157 is a wasteful number, since it uses less digits than its factorization.

87321157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21468.

The product of its digits is 11760, while the sum is 34.

The square root of 87321157 is about 9344.5790167348. The cubic root of 87321157 is about 443.6493271060.

It can be divided in two parts, 87321 and 157, that added together give a palindrome (87478).

The spelling of 87321157 in words is "eighty-seven million, three hundred twenty-one thousand, one hundred fifty-seven".