887866621 has 4 divisors (see below), whose sum is σ = 892998972. Its totient is φ = 882734272.

The previous prime is 887866619. The next prime is 887866627. The reversal of 887866621 is 126668788.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 508006521 + 379860100 = 22539^2 + 19490^2 .

It is a cyclic number.

It is not a de Polignac number, because 887866621 - 2¹ = 887866619 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 (887866627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2565916 + ... + 2566261.

It is an arithmetic number, because the mean of its divisors is an integer number (223249743).

Almost surely, 2^887866621 is an apocalyptic number.

It is an amenable number.

887866621 is a deficient number, since it is larger than the sum of its proper divisors (5132351).

887866621 is a wasteful number, since it uses less digits than its factorization.

887866621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5132350.

The product of its digits is 1548288, while the sum is 52.

The square root of 887866621 is about 29797.0908143731. The cubic root of 887866621 is about 961.1309807924.

The spelling of 887866621 in words is "eight hundred eighty-seven million, eight hundred sixty-six thousand, six hundred twenty-one".