25998520 has 32 divisors (see below), whose sum is σ = 59745600. Its totient is φ = 10177408.

The previous prime is 25998509. The next prime is 25998521. The reversal of 25998520 is 2589952.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25998521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5035 + ... + 8794.

It is an arithmetic number, because the mean of its divisors is an integer number (1867050).

Almost surely, 2^25998520 is an apocalyptic number.

25998520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25998520 is an abundant number, since it is smaller than the sum of its proper divisors (33747080).

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

25998520 is a wasteful number, since it uses less digits than its factorization.

25998520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13887 (or 13883 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 40.

The square root of 25998520 is about 5098.8743855875. The cubic root of 25998520 is about 296.2439855877.

The spelling of 25998520 in words is "twenty-five million, nine hundred ninety-eight thousand, five hundred twenty".