25658240 has 64 divisors (see below), whose sum is σ = 62717760. Its totient is φ = 10033152.

The previous prime is 25658239. The next prime is 25658263. The reversal of 25658240 is 4285652.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 25658197 and 25658206.

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, 29654 + ... + 30506.

It is an arithmetic number, because the mean of its divisors is an integer number (979965).

Almost surely, 2^25658240 is an apocalyptic number.

25658240 is a gapful number since it is divisible by the number (20) 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 25658240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31358880).

25658240 is an abundant number, since it is smaller than the sum of its proper divisors (37059520).

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

25658240 is an equidigital number, since it uses as much as digits as its factorization.

25658240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 919 (or 907 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 32.

The square root of 25658240 is about 5065.3963319764. The cubic root of 25658240 is about 294.9458485301.

The spelling of 25658240 in words is "twenty-five million, six hundred fifty-eight thousand, two hundred forty".