25081000 has 64 divisors (see below), whose sum is σ = 67092480. Its totient is φ = 8596800.

The previous prime is 25080983. The next prime is 25081013. The reversal of 25081000 is 18052.

It is a happy number.

It is a super-2 number, since 2×25081000² = 1258113122000000, which contains 22 as substring.

It is a congruent number.

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, 5209 + ... + 8791.

It is an arithmetic number, because the mean of its divisors is an integer number (1048320).

Almost surely, 2^25081000 is an apocalyptic number.

25081000 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 25081000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33546240).

25081000 is an abundant number, since it is smaller than the sum of its proper divisors (42011480).

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

25081000 is a wasteful number, since it uses less digits than its factorization.

25081000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3611 (or 3597 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 25081000 is about 5008.0934496073. The cubic root of 25081000 is about 292.7172272922.

Adding to 25081000 its reverse (18052), we get a palindrome (25099052).

It can be divided in two parts, 250 and 81000, that multiplied together give a square (20250000 = 4500²).

The spelling of 25081000 in words is "twenty-five million, eighty-one thousand".