25155280 has 20 divisors (see below), whose sum is σ = 58486212. Its totient is φ = 10062080.

The previous prime is 25155239. The next prime is 25155287. The reversal of 25155280 is 8255152.

It can be written as a sum of positive squares in 2 ways, for example, as 19044496 + 6110784 = 4364^2 + 2472^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×25155280² = 1265576223756800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25155287) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 157141 + ... + 157300.

Almost surely, 2^25155280 is an apocalyptic number.

25155280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25155280 is an abundant number, since it is smaller than the sum of its proper divisors (33330932).

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

25155280 is a wasteful number, since it uses less digits than its factorization.

25155280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314454 (or 314448 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 28.

The square root of 25155280 is about 5015.5039627140. The cubic root of 25155280 is about 293.0059133644.

The spelling of 25155280 in words is "twenty-five million, one hundred fifty-five thousand, two hundred eighty".