25812040 has 48 divisors (see below), whose sum is σ = 59629500. Its totient is φ = 10055808.

The previous prime is 25812037. The next prime is 25812041. The reversal of 25812040 is 4021852.

It can be written as a sum of positive squares in 2 ways, for example, as 25745476 + 66564 = 5074^2 + 258^2 .

It is a super-2 number, since 2×25812040² = 1332522817923200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25812041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 73786 + ... + 74134.

Almost surely, 2^25812040 is an apocalyptic number.

25812040 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 25812040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29814750).

25812040 is an abundant number, since it is smaller than the sum of its proper divisors (33817460).

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

25812040 is a wasteful number, since it uses less digits than its factorization.

25812040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 446 (or 399 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 25812040 is about 5080.5550877832. Note that the first 3 decimals coincide. The cubic root of 25812040 is about 295.5339940259.

Adding to 25812040 its reverse (4021852), we get a palindrome (29833892).

The spelling of 25812040 in words is "twenty-five million, eight hundred twelve thousand, forty".