25823640 has 32 divisors (see below), whose sum is σ = 77471280. Its totient is φ = 6886272.

The previous prime is 25823639. The next prime is 25823653. The reversal of 25823640 is 4632852.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 25823598 and 25823607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 107479 + ... + 107718.

Almost surely, 2^25823640 is an apocalyptic number.

25823640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25823640 is an abundant number, since it is smaller than the sum of its proper divisors (51647640).

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

25823640 is a wasteful number, since it uses less digits than its factorization.

25823640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215211 (or 215207 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 25823640 is about 5081.6965670925. The cubic root of 25823640 is about 295.5782586522.

The spelling of 25823640 in words is "twenty-five million, eight hundred twenty-three thousand, six hundred forty".