87821157 has 8 divisors (see below), whose sum is σ = 117224640. Its totient is φ = 58482560.

The previous prime is 87821141. The next prime is 87821161. The reversal of 87821157 is 75112878.

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

It is a cyclic number.

It is not a de Polignac number, because 87821157 - 2⁴ = 87821141 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87821137) 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, 12969 + ... + 18542.

It is an arithmetic number, because the mean of its divisors is an integer number (14653080).

Almost surely, 2^87821157 is an apocalyptic number.

It is an amenable number.

87821157 is a deficient number, since it is larger than the sum of its proper divisors (29403483).

87821157 is a wasteful number, since it uses less digits than its factorization.

87821157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32443.

The product of its digits is 31360, while the sum is 39.

The square root of 87821157 is about 9371.2943076183. The cubic root of 87821157 is about 444.4944930976.

It can be divided in two parts, 87821 and 157, that added together give a palindrome (87978).

The spelling of 87821157 in words is "eighty-seven million, eight hundred twenty-one thousand, one hundred fifty-seven".