2858661 has 24 divisors (see below), whose sum is σ = 4540536. Its totient is φ = 1722240.

The previous prime is 2858651. The next prime is 2858699. The reversal of 2858661 is 1668582.

2858661 = 319² + 320² + ... + 344².

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 136161 + 2722500 = 369^2 + 1650^2 .

It is not a de Polignac number, because 2858661 - 2¹⁰ = 2857637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2858621) 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 23 ways as a sum of consecutive naturals, for example, 5971 + ... + 6431.

It is an arithmetic number, because the mean of its divisors is an integer number (189189).

2^2858661 is an apocalyptic number.

It is an amenable number.

2858661 is a deficient number, since it is larger than the sum of its proper divisors (1681875).

2858661 is a wasteful number, since it uses less digits than its factorization.

2858661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 533 (or 530 counting only the distinct ones).

The product of its digits is 23040, while the sum is 36.

The square root of 2858661 is about 1690.7575225324. The cubic root of 2858661 is about 141.9234693082.

The spelling of 2858661 in words is "two million, eight hundred fifty-eight thousand, six hundred sixty-one".