2661540 has 48 divisors (see below), whose sum is σ = 8518272. Its totient is φ = 608256.

The previous prime is 2661517. The next prime is 2661541. The reversal of 2661540 is 451662.

It is a self number, because there is not a number n which added to its sum of digits gives 2661540.

It is not an unprimeable number, because it can be changed into a prime (2661541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2749 + ... + 3588.

It is an arithmetic number, because the mean of its divisors is an integer number (177464).

2^2661540 is an apocalyptic number.

2661540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2661540 is an abundant number, since it is smaller than the sum of its proper divisors (5856732).

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

2661540 is a wasteful number, since it uses less digits than its factorization.

2661540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6356 (or 6354 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 2661540 is about 1631.4226920084. The cubic root of 2661540 is about 138.5833320577.

The spelling of 2661540 in words is "two million, six hundred sixty-one thousand, five hundred forty".