2640261285 has 16 divisors (see below), whose sum is σ = 4693798080. Its totient is φ = 1408139280.

The previous prime is 2640261263. The next prime is 2640261311. The reversal of 2640261285 is 5821620462.

It is a happy number.

2640261285 is a `hidden beast` number, since 2 + 640 + 2 + 6 + 1 + 2 + 8 + 5 = 666.

It is not a de Polignac number, because 2640261285 - 2¹⁰ = 2640260261 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9778611 + ... + 9778880.

It is an arithmetic number, because the mean of its divisors is an integer number (293362380).

Almost surely, 2^2640261285 is an apocalyptic number.

It is an amenable number.

2640261285 is a deficient number, since it is larger than the sum of its proper divisors (2053536795).

2640261285 is a wasteful number, since it uses less digits than its factorization.

2640261285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19557505 (or 19557499 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 36.

The square root of 2640261285 is about 51383.4728779595. The cubic root of 2640261285 is about 1382.1302402035.

The spelling of 2640261285 in words is "two billion, six hundred forty million, two hundred sixty-one thousand, two hundred eighty-five".