2851668 has 36 divisors (see below), whose sum is σ = 7282548. Its totient is φ = 940800.

The previous prime is 2851661. The next prime is 2851727. The reversal of 2851668 is 8661582.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1077444 + 1774224 = 1038^2 + 1332^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2851661) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3718 + ... + 4418.

It is an arithmetic number, because the mean of its divisors is an integer number (202293).

2^2851668 is an apocalyptic number.

It is an amenable number.

2851668 is an abundant number, since it is smaller than the sum of its proper divisors (4430880).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2851668 is a wasteful number, since it uses less digits than its factorization.

2851668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 824 (or 819 counting only the distinct ones).

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

The square root of 2851668 is about 1688.6882483158. The cubic root of 2851668 is about 141.8076480431.

It can be divided in two parts, 285 and 1668, that added together give a triangular number (1953 = T₆₂).

The spelling of 2851668 in words is "two million, eight hundred fifty-one thousand, six hundred sixty-eight".