25001000 has 64 divisors (see below), whose sum is σ = 61102080. Its totient is φ = 9556800.

The previous prime is 25000991. The next prime is 25001029. The reversal of 25001000 is 10052.

It is a Harshad number since it is a multiple of its sum of digits (8).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22457 + ... + 23543.

It is an arithmetic number, because the mean of its divisors is an integer number (954720).

Almost surely, 2^25001000 is an apocalyptic number.

25001000 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 25001000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30551040).

25001000 is an abundant number, since it is smaller than the sum of its proper divisors (36101080).

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

25001000 is a wasteful number, since it uses less digits than its factorization.

25001000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1131 (or 1117 counting only the distinct ones).

The product of its (nonzero) digits is 10, while the sum is 8.

The square root of 25001000 is about 5000.0999990000. The cubic root of 25001000 is about 292.4056724596.

Adding to 25001000 its reverse (10052), we get a palindrome (25011052).

The spelling of 25001000 in words is "twenty-five million, one thousand".