2530640 has 40 divisors (see below), whose sum is σ = 6725760. Its totient is φ = 867456.

The previous prime is 2530597. The next prime is 2530663. The reversal of 2530640 is 460352.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1700 + ... + 2819.

It is an arithmetic number, because the mean of its divisors is an integer number (168144).

2^2530640 is an apocalyptic number.

2530640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2530640 is an abundant number, since it is smaller than the sum of its proper divisors (4195120).

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

2530640 is a wasteful number, since it uses less digits than its factorization.

2530640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4539 (or 4533 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 2530640 is about 1590.7985416136. The cubic root of 2530640 is about 136.2730959921.

Adding to 2530640 its reverse (460352), we get a palindrome (2990992).

The spelling of 2530640 in words is "two million, five hundred thirty thousand, six hundred forty".