25998740 has 24 divisors (see below), whose sum is σ = 56972160. Its totient is φ = 9947168.

The previous prime is 25998737. The next prime is 25998757. The reversal of 25998740 is 4789952.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 25998691 and 25998700.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27800 + ... + 28719.

It is an arithmetic number, because the mean of its divisors is an integer number (2373840).

Almost surely, 2^25998740 is an apocalyptic number.

25998740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25998740 is an abundant number, since it is smaller than the sum of its proper divisors (30973420).

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

25998740 is a wasteful number, since it uses less digits than its factorization.

25998740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56551 (or 56549 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 44.

The square root of 25998740 is about 5098.8959589307. The cubic root of 25998740 is about 296.2448211929.

The spelling of 25998740 in words is "twenty-five million, nine hundred ninety-eight thousand, seven hundred forty".