2640996 has 18 divisors (see below), whose sum is σ = 6675942. Its totient is φ = 880320.

The previous prime is 2640973. The next prime is 2640997. The reversal of 2640996 is 6990462.

2640996 is a `hidden beast` number, since 2 + 640 + 9 + 9 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 2528100 + 112896 = 1590^2 + 336^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 73361 = 2640996 / (2 + 6 + 4 + 0 + 9 + 9 + 6).

It is a nialpdrome in base 12.

It is a self number, because there is not a number n which added to its sum of digits gives 2640996.

It is not an unprimeable number, because it can be changed into a prime (2640997) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 36645 + ... + 36716.

2^2640996 is an apocalyptic number.

It is an amenable number.

2640996 is an abundant number, since it is smaller than the sum of its proper divisors (4034946).

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

2640996 is a wasteful number, since it uses less digits than its factorization.

2640996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73371 (or 73366 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The square root of 2640996 is about 1625.1141498369. The cubic root of 2640996 is about 138.2258431764.

The spelling of 2640996 in words is "two million, six hundred forty thousand, nine hundred ninety-six".