25997550 has 48 divisors (see below), whose sum is σ = 64817280. Its totient is φ = 6895840.

The previous prime is 25997527. The next prime is 25997551. The reversal of 25997550 is 5579952.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25997551) 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 23 ways as a sum of consecutive naturals, for example, 39121 + ... + 39779.

It is an arithmetic number, because the mean of its divisors is an integer number (1350360).

Almost surely, 2^25997550 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25997550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32408640).

25997550 is an abundant number, since it is smaller than the sum of its proper divisors (38819730).

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

25997550 is a wasteful number, since it uses less digits than its factorization.

25997550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 937 (or 932 counting only the distinct ones).

The product of its (nonzero) digits is 141750, while the sum is 42.

The square root of 25997550 is about 5098.7792656674. The cubic root of 25997550 is about 296.2403012723.

The spelling of 25997550 in words is "twenty-five million, nine hundred ninety-seven thousand, five hundred fifty".