2640263 has 4 divisors (see below), whose sum is σ = 2683608. Its totient is φ = 2596920.

The previous prime is 2640251. The next prime is 2640271. The reversal of 2640263 is 3620462.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2640263 - 2¹⁰ = 2639239 is a prime.

It is a d-powerful number, because it can be written as 2¹⁹ + 6² + 4⁷ + 0 + 2²¹ + 6³ + 3⁷ .

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2640163) 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, 21581 + ... + 21702.

It is an arithmetic number, because the mean of its divisors is an integer number (670902).

2^2640263 is an apocalyptic number.

2640263 is a deficient number, since it is larger than the sum of its proper divisors (43345).

2640263 is an equidigital number, since it uses as much as digits as its factorization.

2640263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43344.

The product of its (nonzero) digits is 1728, while the sum is 23.

The square root of 2640263 is about 1624.8886115670. Note that the first 3 decimals coincide. The cubic root of 2640263 is about 138.2130539461.

The spelling of 2640263 in words is "two million, six hundred forty thousand, two hundred sixty-three".