887721 has 8 divisors (see below), whose sum is σ = 1188000. Its totient is φ = 589632.

The previous prime is 887717. The next prime is 887743. The reversal of 887721 is 127788.

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

It is not a de Polignac number, because 887721 - 2² = 887717 is a prime.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (887701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1201 + ... + 1793.

It is an arithmetic number, because the mean of its divisors is an integer number (148500).

2⁸⁸⁷⁷²¹ is an apocalyptic number.

It is an amenable number.

887721 is a deficient number, since it is larger than the sum of its proper divisors (300279).

887721 is a wasteful number, since it uses less digits than its factorization.

887721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1095.

The product of its digits is 6272, while the sum is 33.

The square root of 887721 is about 942.1894713910. The cubic root of 887721 is about 96.1078432169.

The spelling of 887721 in words is "eight hundred eighty-seven thousand, seven hundred twenty-one".