25645428 has 36 divisors (see below), whose sum is σ = 66053988. Its totient is φ = 8386560.

The previous prime is 25645427. The next prime is 25645429. The reversal of 25645428 is 82454652.

It is a happy number.

25645428 is a `hidden beast` number, since 2 + 5 + 645 + 4 + 2 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (25645427) and next prime (25645429).

It can be written as a sum of positive squares in 2 ways, for example, as 10575504 + 15069924 = 3252^2 + 3882^2 .

It is a tau number, because it is divible by the number of its divisors (36).

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

It is a junction number, because it is equal to n+sod(n) for n = 25645392 and 25645401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25645427) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4813 + ... + 8628.

It is an arithmetic number, because the mean of its divisors is an integer number (1834833).

Almost surely, 2^25645428 is an apocalyptic number.

It is an amenable number.

25645428 is an abundant number, since it is smaller than the sum of its proper divisors (40408560).

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

25645428 is a wasteful number, since it uses less digits than its factorization.

25645428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13504 (or 13499 counting only the distinct ones).

The product of its digits is 76800, while the sum is 36.

The square root of 25645428 is about 5064.1315148799. The cubic root of 25645428 is about 294.8967483144.

The spelling of 25645428 in words is "twenty-five million, six hundred forty-five thousand, four hundred twenty-eight".