25824640 has 32 divisors (see below), whose sum is σ = 61738560. Its totient is φ = 10329600.

The previous prime is 25824619. The next prime is 25824641. The reversal of 25824640 is 4642852.

It is a tau number, because it is divible by the number of its divisors (32).

It is a super-2 number, since 2×25824640² = 1333824062259200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25824641) 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, 19536 + ... + 20815.

It is an arithmetic number, because the mean of its divisors is an integer number (1929330).

Almost surely, 2^25824640 is an apocalyptic number.

25824640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25824640 is an abundant number, since it is smaller than the sum of its proper divisors (35913920).

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

25824640 is an equidigital number, since it uses as much as digits as its factorization.

25824640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40370 (or 40358 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 31.

The square root of 25824640 is about 5081.7949584768. The cubic root of 25824640 is about 295.5820739476.

The spelling of 25824640 in words is "twenty-five million, eight hundred twenty-four thousand, six hundred forty".