2563640 has 16 divisors (see below), whose sum is σ = 5768280. Its totient is φ = 1025440.

The previous prime is 2563633. The next prime is 2563643. The reversal of 2563640 is 463652.

2563640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2563643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32006 + ... + 32085.

2^2563640 is an apocalyptic number.

2563640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2563640 is an abundant number, since it is smaller than the sum of its proper divisors (3204640).

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

2563640 is a wasteful number, since it uses less digits than its factorization.

2563640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64102 (or 64098 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 26.

The square root of 2563640 is about 1601.1370959415. The cubic root of 2563640 is about 136.8628816165.

The spelling of 2563640 in words is "two million, five hundred sixty-three thousand, six hundred forty".