2640646 has 8 divisors (see below), whose sum is σ = 4057704. Its totient is φ = 1288080.

The previous prime is 2640643. The next prime is 2640683. The reversal of 2640646 is 6460462.

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

It is a super-2 number, since 2×2640646² = 13946022594632, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2640643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16020 + ... + 16183.

It is an arithmetic number, because the mean of its divisors is an integer number (507213).

2^2640646 is an apocalyptic number.

2640646 is a deficient number, since it is larger than the sum of its proper divisors (1417058).

2640646 is a wasteful number, since it uses less digits than its factorization.

2640646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32246.

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 2640646 is about 1625.0064615256. The cubic root of 2640646 is about 138.2197367450.

The spelling of 2640646 in words is "two million, six hundred forty thousand, six hundred forty-six".