2528002781 has 4 divisors (see below), whose sum is σ = 2529419232. Its totient is φ = 2526586332.

The previous prime is 2528002769. The next prime is 2528002817. The reversal of 2528002781 is 1872008252.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2528002781 - 2⁶ = 2528002717 is a prime.

It is a super-2 number, since 2×2528002781² = 12781596121487467922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2528002751) 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, 705545 + ... + 709118.

It is an arithmetic number, because the mean of its divisors is an integer number (632354808).

Almost surely, 2^2528002781 is an apocalyptic number.

It is an amenable number.

2528002781 is a deficient number, since it is larger than the sum of its proper divisors (1416451).

2528002781 is a wasteful number, since it uses less digits than its factorization.

2528002781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1416450.

The product of its (nonzero) digits is 17920, while the sum is 35.

The square root of 2528002781 is about 50279.2480154586. The cubic root of 2528002781 is about 1362.2574210678.

The spelling of 2528002781 in words is "two billion, five hundred twenty-eight million, two thousand, seven hundred eighty-one".