2645690 has 16 divisors (see below), whose sum is σ = 4969728. Its totient is φ = 1012176.

The previous prime is 2645681. The next prime is 2645701. The reversal of 2645690 is 965462.

2645690 = 91² + 92² + ... + 205².

It is a super-2 number, since 2×2645690² = 13999351152200, which contains 22 as substring.

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, 5522 + ... + 5981.

It is an arithmetic number, because the mean of its divisors is an integer number (310608).

2^2645690 is an apocalyptic number.

2645690 is a deficient number, since it is larger than the sum of its proper divisors (2324038).

2645690 is a wasteful number, since it uses less digits than its factorization.

2645690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11533.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 2645690 is about 1626.5577149305. The cubic root of 2645690 is about 138.3076870570.

The spelling of 2645690 in words is "two million, six hundred forty-five thousand, six hundred ninety".