2606640 has 40 divisors (see below), whose sum is σ = 8081328. Its totient is φ = 695040.

The previous prime is 2606633. The next prime is 2606651. The reversal of 2606640 is 466062.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 2606640.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5191 + ... + 5670.

2^2606640 is an apocalyptic number.

2606640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2606640 is an abundant number, since it is smaller than the sum of its proper divisors (5474688).

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

2606640 is a wasteful number, since it uses less digits than its factorization.

2606640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10877 (or 10871 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 2606640 is about 1614.5092133525. The cubic root of 2606640 is about 137.6238443445.

It can be divided in two parts, 26066 and 40, that added together give a triangular number (26106 = T₂₂₈).

The spelling of 2606640 in words is "two million, six hundred six thousand, six hundred forty".