25641984 has 88 divisors (see below), whose sum is σ = 72512928. Its totient is φ = 8028160.

The previous prime is 25641971. The next prime is 25641989. The reversal of 25641984 is 48914652.

It is a super-2 number, since 2×25641984² = 1315022686912512, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25641989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51979 + ... + 52469.

Almost surely, 2^25641984 is an apocalyptic number.

25641984 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25641984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36256464).

25641984 is an abundant number, since it is smaller than the sum of its proper divisors (46870944).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25641984 is a wasteful number, since it uses less digits than its factorization.

25641984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 531 (or 513 counting only the distinct ones).

The product of its digits is 69120, while the sum is 39.

The square root of 25641984 is about 5063.7914649006. The cubic root of 25641984 is about 294.8835468727.

The spelling of 25641984 in words is "twenty-five million, six hundred forty-one thousand, nine hundred eighty-four".