2645280 has 144 divisors (see below), whose sum is σ = 9906624. Its totient is φ = 637440.

The previous prime is 2645267. The next prime is 2645297. The reversal of 2645280 is 825462.

It is a tau number, because it is divible by the number of its divisors (144).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15757 + ... + 15923.

It is an arithmetic number, because the mean of its divisors is an integer number (68796).

2^2645280 is an apocalyptic number.

2645280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2645280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4953312).

2645280 is an abundant number, since it is smaller than the sum of its proper divisors (7261344).

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

2645280 is a wasteful number, since it uses less digits than its factorization.

2645280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199 (or 188 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 2645280 is about 1626.4316770157. The cubic root of 2645280 is about 138.3005422188.

The spelling of 2645280 in words is "two million, six hundred forty-five thousand, two hundred eighty".