2640872 has 32 divisors (see below), whose sum is σ = 5426400. Its totient is φ = 1197504.

The previous prime is 2640871. The next prime is 2640881. The reversal of 2640872 is 2780462.

It is not an unprimeable number, because it can be changed into a prime (2640871) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6779 + ... + 7157.

It is an arithmetic number, because the mean of its divisors is an integer number (169575).

2^2640872 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2640872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2713200).

2640872 is an abundant number, since it is smaller than the sum of its proper divisors (2785528).

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

2640872 is a wasteful number, since it uses less digits than its factorization.

2640872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 465 (or 461 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 29.

The square root of 2640872 is about 1625.0759982229. The cubic root of 2640872 is about 138.2236798167.

The spelling of 2640872 in words is "two million, six hundred forty thousand, eight hundred seventy-two".