25801000 has 32 divisors (see below), whose sum is σ = 60376680. Its totient is φ = 10320000.

The previous prime is 25800997. The next prime is 25801049. The reversal of 25801000 is 10852.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 7806436 + 17994564 = 2794^2 + 4242^2 .

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, 11901 + ... + 13900.

Almost surely, 2^25801000 is an apocalyptic number.

25801000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25801000 is an abundant number, since it is smaller than the sum of its proper divisors (34575680).

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

25801000 is a wasteful number, since it uses less digits than its factorization.

25801000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25822 (or 25808 counting only the distinct ones).

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

The square root of 25801000 is about 5079.4684761302. The cubic root of 25801000 is about 295.4918539941.

Adding to 25801000 its reverse (10852), we get a palindrome (25811852).

It can be divided in two parts, 25 and 801000, that added together give a square (801025 = 895²).

The spelling of 25801000 in words is "twenty-five million, eight hundred one thousand".