2686645 has 8 divisors (see below), whose sum is σ = 3472056. Its totient is φ = 1983936.

The previous prime is 2686631. The next prime is 2686667. The reversal of 2686645 is 5466862.

2686645 = 6² + 7² + ... + 200².

It can be written as a sum of positive squares in 4 ways, for example, as 418609 + 2268036 = 647^2 + 1506^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 2686645 - 2⁹ = 2686133 is a prime.

It is a super-2 number, since 2×2686645² = 14436122712050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20602 + ... + 20731.

It is an arithmetic number, because the mean of its divisors is an integer number (434007).

2^2686645 is an apocalyptic number.

It is an amenable number.

2686645 is a deficient number, since it is larger than the sum of its proper divisors (785411).

2686645 is a wasteful number, since it uses less digits than its factorization.

2686645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41351.

The product of its digits is 69120, while the sum is 37.

The square root of 2686645 is about 1639.0988377764. The cubic root of 2686645 is about 139.0176986935.

The spelling of 2686645 in words is "two million, six hundred eighty-six thousand, six hundred forty-five".