87945921 has 24 divisors (see below), whose sum is σ = 147925440. Its totient is φ = 49304736.

The previous prime is 87945901. The next prime is 87945937. The reversal of 87945921 is 12954978.

It is not a de Polignac number, because 87945921 - 2¹⁷ = 87814849 is a prime.

It is not an unprimeable number, because it can be changed into a prime (87945901) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9831 + ... + 16508.

It is an arithmetic number, because the mean of its divisors is an integer number (6163560).

Almost surely, 2^87945921 is an apocalyptic number.

It is an amenable number.

87945921 is a deficient number, since it is larger than the sum of its proper divisors (59979519).

87945921 is a wasteful number, since it uses less digits than its factorization.

87945921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26405 (or 26402 counting only the distinct ones).

The product of its digits is 181440, while the sum is 45.

The square root of 87945921 is about 9377.9486562894. The cubic root of 87945921 is about 444.7048853377.

The spelling of 87945921 in words is "eighty-seven million, nine hundred forty-five thousand, nine hundred twenty-one".