2528639 has 4 divisors (see below), whose sum is σ = 2610240. Its totient is φ = 2447040.

The previous prime is 2528629. The next prime is 2528651. The reversal of 2528639 is 9368252.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2528639 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2528599 and 2528608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2528629) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40754 + ... + 40815.

It is an arithmetic number, because the mean of its divisors is an integer number (652560).

2^2528639 is an apocalyptic number.

2528639 is a deficient number, since it is larger than the sum of its proper divisors (81601).

2528639 is an equidigital number, since it uses as much as digits as its factorization.

2528639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81600.

The product of its digits is 25920, while the sum is 35.

The square root of 2528639 is about 1590.1694878220. The cubic root of 2528639 is about 136.2371690636.

The spelling of 2528639 in words is "two million, five hundred twenty-eight thousand, six hundred thirty-nine".