25661448 has 60 divisors (see below), whose sum is σ = 72238815. Its totient is φ = 8510832.

The previous prime is 25661443. The next prime is 25661453. The reversal of 25661448 is 84416652.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It is an interprime number because it is at equal distance from previous prime (25661443) and next prime (25661453).

It can be written as a sum of positive squares in only one way, i.e., 12830724 + 12830724 = 3582^2 + 3582^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=3582.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (25661443) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 128853 + ... + 129051.

Almost surely, 2^25661448 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25661448

25661448 is an abundant number, since it is smaller than the sum of its proper divisors (46577367).

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

25661448 is an equidigital number, since it uses as much as digits as its factorization.

25661448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 416 (or 204 counting only the distinct ones).

The product of its digits is 46080, while the sum is 36.

The square root of 25661448 is about 5065.7129804204. The cubic root of 25661448 is about 294.9581401871.

The spelling of 25661448 in words is "twenty-five million, six hundred sixty-one thousand, four hundred forty-eight".