2625640 has 32 divisors (see below), whose sum is σ = 6055560. Its totient is φ = 1024000.

The previous prime is 2625619. The next prime is 2625641. The reversal of 2625640 is 465262.

It can be written as a sum of positive squares in 4 ways, for example, as 2268036 + 357604 = 1506^2 + 598^2 .

It is not an unprimeable number, because it can be changed into a prime (2625641) 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, 840 + ... + 2440.

2^2625640 is an apocalyptic number.

2625640 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 2625640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3027780).

2625640 is an abundant number, since it is smaller than the sum of its proper divisors (3429920).

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

2625640 is a wasteful number, since it uses less digits than its factorization.

2625640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1653 (or 1649 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 2625640 is about 1620.3826708528. The cubic root of 2625640 is about 137.9574187746.

The spelling of 2625640 in words is "two million, six hundred twenty-five thousand, six hundred forty".