2528698891 has 4 divisors (see below), whose sum is σ = 2528830512. Its totient is φ = 2528567272.

The previous prime is 2528698889. The next prime is 2528698897. The reversal of 2528698891 is 1988968252.

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

It is a cyclic number.

It is not a de Polignac number, because 2528698891 - 2¹ = 2528698889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2528698897) 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, 30775 + ... + 77488.

It is an arithmetic number, because the mean of its divisors is an integer number (632207628).

Almost surely, 2^2528698891 is an apocalyptic number.

2528698891 is a deficient number, since it is larger than the sum of its proper divisors (131621).

2528698891 is a wasteful number, since it uses less digits than its factorization.

2528698891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131620.

The product of its digits is 4976640, while the sum is 58.

The square root of 2528698891 is about 50286.1699774401. The cubic root of 2528698891 is about 1362.3824465087.

The spelling of 2528698891 in words is "two billion, five hundred twenty-eight million, six hundred ninety-eight thousand, eight hundred ninety-one".