25555428 has 36 divisors (see below), whose sum is σ = 65075920. Its totient is φ = 8455536.

The previous prime is 25555427. The next prime is 25555429. The reversal of 25555428 is 82455552.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (25555427) and next prime (25555429).

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

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

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 = 25555392 and 25555401.

It is not an unprimeable number, because it can be changed into a prime (25555427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2451 + ... + 7557.

Almost surely, 2^25555428 is an apocalyptic number.

It is an amenable number.

25555428 is an abundant number, since it is smaller than the sum of its proper divisors (39520492).

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

25555428 is a wasteful number, since it uses less digits than its factorization.

25555428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5256 (or 5251 counting only the distinct ones).

The product of its digits is 80000, while the sum is 36.

The square root of 25555428 is about 5055.2376798722. The cubic root of 25555428 is about 294.5513740133.

The spelling of 25555428 in words is "twenty-five million, five hundred fifty-five thousand, four hundred twenty-eight".