2605690 has 8 divisors (see below), whose sum is σ = 4690260. Its totient is φ = 1042272.

The previous prime is 2605663. The next prime is 2605741. The reversal of 2605690 is 965062.

It can be written as a sum of positive squares in 2 ways, for example, as 2368521 + 237169 = 1539^2 + 487^2 .

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

It is a super-2 number, since 2×2605690² = 13579240752200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 130275 + ... + 130294.

2^2605690 is an apocalyptic number.

2605690 is a deficient number, since it is larger than the sum of its proper divisors (2084570).

2605690 is a wasteful number, since it uses less digits than its factorization.

2605690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260576.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 2605690 is about 1614.2149794869. The cubic root of 2605690 is about 137.6071231327.

The spelling of 2605690 in words is "two million, six hundred five thousand, six hundred ninety".