25891000 has 64 divisors (see below), whose sum is σ = 64190880. Its totient is φ = 9740800.

The previous prime is 25890989. The next prime is 25891001. The reversal of 25891000 is 19852.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25891001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16239 + ... + 17761.

Almost surely, 2^25891000 is an apocalyptic number.

25891000 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 25891000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32095440).

25891000 is an abundant number, since it is smaller than the sum of its proper divisors (38299880).

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

25891000 is a wasteful number, since it uses less digits than its factorization.

25891000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1561 (or 1547 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 25891000 is about 5088.3199584932. The cubic root of 25891000 is about 295.8350371301.

The spelling of 25891000 in words is "twenty-five million, eight hundred ninety-one thousand".