2528409781 has 8 divisors (see below), whose sum is σ = 2663017280. Its totient is φ = 2393955648.

The previous prime is 2528409739. The next prime is 2528409799. The reversal of 2528409781 is 1879048252.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2528409781 - 2¹⁵ = 2528377013 is a prime.

It is a super-2 number, since 2×2528409781² = 12785712041312935922, 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 (2528409721) 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 7 ways as a sum of consecutive naturals, for example, 3681 + ... + 71206.

It is an arithmetic number, because the mean of its divisors is an integer number (332877160).

Almost surely, 2^2528409781 is an apocalyptic number.

It is an amenable number.

2528409781 is a deficient number, since it is larger than the sum of its proper divisors (134607499).

2528409781 is a wasteful number, since it uses less digits than its factorization.

2528409781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76683.

The product of its (nonzero) digits is 322560, while the sum is 46.

The square root of 2528409781 is about 50283.2952480245. The cubic root of 2528409781 is about 1362.3305234424.

The spelling of 2528409781 in words is "two billion, five hundred twenty-eight million, four hundred nine thousand, seven hundred eighty-one".