25775988 has 24 divisors (see below), whose sum is σ = 68736192. Its totient is φ = 7364544.

The previous prime is 25775987. The next prime is 25775999. The reversal of 25775988 is 88957752.

It is a super-2 number, since 2×25775988² = 1328803114752288, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 25775988.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25775987) 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 7 ways as a sum of consecutive naturals, for example, 153345 + ... + 153512.

It is an arithmetic number, because the mean of its divisors is an integer number (2864008).

Almost surely, 2^25775988 is an apocalyptic number.

25775988 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

25775988 is an abundant number, since it is smaller than the sum of its proper divisors (42960204).

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

25775988 is a wasteful number, since it uses less digits than its factorization.

25775988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306871 (or 306869 counting only the distinct ones).

The product of its digits is 1411200, while the sum is 51.

The square root of 25775988 is about 5077.0058105147. The cubic root of 25775988 is about 295.3963379053.

It can be divided in two parts, 257 and 75988, that added together give a triangular number (76245 = T₃₉₀).

The spelling of 25775988 in words is "twenty-five million, seven hundred seventy-five thousand, nine hundred eighty-eight".