3205640 has 16 divisors (see below), whose sum is σ = 7212780. Its totient is φ = 1282240.

The previous prime is 3205637. The next prime is 3205651. The reversal of 3205640 is 465023.

It can be written as a sum of positive squares in 2 ways, for example, as 3147076 + 58564 = 1774^2 + 242^2 .

It is a super-2 number, since 2×3205640² = 20552255619200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

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, 40031 + ... + 40110.

Almost surely, 2^3205640 is an apocalyptic number.

It is an amenable number.

3205640 is an abundant number, since it is smaller than the sum of its proper divisors (4007140).

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

3205640 is a wasteful number, since it uses less digits than its factorization.

3205640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80152 (or 80148 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 3205640 is about 1790.4301159219. The cubic root of 3205640 is about 147.4477838729.

The spelling of 3205640 in words is "three million, two hundred five thousand, six hundred forty".