25665040 has 40 divisors (see below), whose sum is σ = 59882328. Its totient is φ = 10229760.

The previous prime is 25664983. The next prime is 25665041. The reversal of 25665040 is 4056652.

It can be written as a sum of positive squares in 4 ways, for example, as 2663424 + 23001616 = 1632^2 + 4796^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (25665041) 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 7 ways as a sum of consecutive naturals, for example, 42984 + ... + 43576.

Almost surely, 2^25665040 is an apocalyptic number.

25665040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25665040 is an abundant number, since it is smaller than the sum of its proper divisors (34217288).

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

25665040 is a wasteful number, since it uses less digits than its factorization.

25665040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1147 (or 1141 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 25665040 is about 5066.0675084329. The cubic root of 25665040 is about 294.9719019489.

The spelling of 25665040 in words is "twenty-five million, six hundred sixty-five thousand, forty".