25575552 has 72 divisors (see below), whose sum is σ = 74093565. Its totient is φ = 8467968.

The previous prime is 25575551. The next prime is 25575553. The reversal of 25575552 is 25557552.

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.

25575552 is a `hidden beast` number, since 2 + 557 + 55 + 52 = 666.

It is an interprime number because it is at equal distance from previous prime (25575551) and next prime (25575553).

It can be written as a sum of positive squares in 2 ways, for example, as 21013056 + 4562496 = 4584^2 + 2136^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=3576.

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 (25575551) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 171574 + ... + 171722.

Almost surely, 2^25575552 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 25575552

25575552 is an abundant number, since it is smaller than the sum of its proper divisors (48518013).

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

25575552 is an equidigital number, since it uses as much as digits as its factorization.

25575552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318 (or 154 counting only the distinct ones).

The product of its digits is 87500, while the sum is 36.

The square root of 25575552 is about 5057.2276990462. The cubic root of 25575552 is about 294.6286700072.

The spelling of 25575552 in words is "twenty-five million, five hundred seventy-five thousand, five hundred fifty-two".