2528240881 has 4 divisors (see below), whose sum is σ = 2546695332. Its totient is φ = 2509786432.

The previous prime is 2528240879. The next prime is 2528240887. The reversal of 2528240881 is 1880428252.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2096266225 + 431974656 = 45785^2 + 20784^2 .

It is a cyclic number.

It is not a de Polignac number, because 2528240881 - 2¹ = 2528240879 is a prime.

It is a super-2 number, since 2×2528240881² = 12784003904719312322, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2528240887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9227020 + ... + 9227293.

It is an arithmetic number, because the mean of its divisors is an integer number (636673833).

Almost surely, 2^2528240881 is an apocalyptic number.

It is an amenable number.

2528240881 is a deficient number, since it is larger than the sum of its proper divisors (18454451).

2528240881 is a wasteful number, since it uses less digits than its factorization.

2528240881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18454450.

The product of its (nonzero) digits is 81920, while the sum is 40.

The square root of 2528240881 is about 50281.6157357736. The cubic root of 2528240881 is about 1362.3001878073.

The spelling of 2528240881 in words is "two billion, five hundred twenty-eight million, two hundred forty thousand, eight hundred eighty-one".