2528423681 has 4 divisors (see below), whose sum is σ = 2889627072. Its totient is φ = 2167220292.

The previous prime is 2528423663. The next prime is 2528423687. The reversal of 2528423681 is 1863248252.

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 2528423681 - 2¹⁰ = 2528422657 is a prime.

It is a super-2 number, since 2×2528423681² = 12785852621283179522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2528423687) 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, 180601685 + ... + 180601698.

It is an arithmetic number, because the mean of its divisors is an integer number (722406768).

Almost surely, 2^2528423681 is an apocalyptic number.

It is an amenable number.

2528423681 is a deficient number, since it is larger than the sum of its proper divisors (361203391).

2528423681 is an equidigital number, since it uses as much as digits as its factorization.

2528423681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361203390.

The product of its digits is 184320, while the sum is 41.

The square root of 2528423681 is about 50283.4334647108. The cubic root of 2528423681 is about 1362.3330199205. Note that the first 3 decimals are identical.

The spelling of 2528423681 in words is "two billion, five hundred twenty-eight million, four hundred twenty-three thousand, six hundred eighty-one".