87870321 has 36 divisors (see below), whose sum is σ = 159455296. Its totient is φ = 45642960.

The previous prime is 87870311. The next prime is 87870347. The reversal of 87870321 is 12307878.

It is not a de Polignac number, because 87870321 - 2¹⁵ = 87837553 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87870311) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1860 + ... + 13386.

Almost surely, 2^87870321 is an apocalyptic number.

It is an amenable number.

87870321 is a deficient number, since it is larger than the sum of its proper divisors (71584975).

87870321 is a wasteful number, since it uses less digits than its factorization.

87870321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11562 (or 11548 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 36.

The square root of 87870321 is about 9373.9170574526. The cubic root of 87870321 is about 444.5774231923.

The spelling of 87870321 in words is "eighty-seven million, eight hundred seventy thousand, three hundred twenty-one".