2634640 has 20 divisors (see below), whose sum is σ = 6125724. Its totient is φ = 1053824.

The previous prime is 2634631. The next prime is 2634649. The reversal of 2634640 is 464362.

It is an interprime number because it is at equal distance from previous prime (2634631) and next prime (2634649).

It can be written as a sum of positive squares in 2 ways, for example, as 467856 + 2166784 = 684^2 + 1472^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (2634649) 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, 16387 + ... + 16546.

2^2634640 is an apocalyptic number.

2634640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2634640 is an abundant number, since it is smaller than the sum of its proper divisors (3491084).

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

2634640 is a wasteful number, since it uses less digits than its factorization.

2634640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32946 (or 32940 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 25.

The square root of 2634640 is about 1623.1574168885. The cubic root of 2634640 is about 138.1148662057.

The spelling of 2634640 in words is "two million, six hundred thirty-four thousand, six hundred forty".