2640660 has 48 divisors (see below), whose sum is σ = 8068032. Its totient is φ = 640000.

The previous prime is 2640643. The next prime is 2640683. The reversal of 2640660 is 660462.

It is a self number, because there is not a number n which added to its sum of digits gives 2640660.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1341 + ... + 2660.

It is an arithmetic number, because the mean of its divisors is an integer number (168084).

2^2640660 is an apocalyptic number.

2640660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2640660 is an abundant number, since it is smaller than the sum of its proper divisors (5427372).

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

2640660 is a wasteful number, since it uses less digits than its factorization.

2640660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4024 (or 4022 counting only the distinct ones).

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

The square root of 2640660 is about 1625.0107691951. The cubic root of 2640660 is about 138.2199810126.

It can be divided in two parts, 2640 and 660, that multiplied together give a square (1742400 = 1320²).

The spelling of 2640660 in words is "two million, six hundred forty thousand, six hundred sixty".