25698840 has 64 divisors (see below), whose sum is σ = 77448960. Its totient is φ = 6821760.

The previous prime is 25698833. The next prime is 25698877. The reversal of 25698840 is 4889652.

It is a junction number, because it is equal to n+sod(n) for n = 25698792 and 25698801.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39397 + ... + 40043.

It is an arithmetic number, because the mean of its divisors is an integer number (1210140).

Almost surely, 2^25698840 is an apocalyptic number.

25698840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25698840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38724480).

25698840 is an abundant number, since it is smaller than the sum of its proper divisors (51750120).

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

25698840 is a wasteful number, since it uses less digits than its factorization.

25698840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 992 (or 988 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 42.

The square root of 25698840 is about 5069.4023316363. The cubic root of 25698840 is about 295.1013345252.

The spelling of 25698840 in words is "twenty-five million, six hundred ninety-eight thousand, eight hundred forty".