25690000 has 100 divisors (see below), whose sum is σ = 71277184. Its totient is φ = 8784000.

The previous prime is 25689991. The next prime is 25690003. The reversal of 25690000 is 9652.

It is a tau number, because it is divible by the number of its divisors (100).

It is a super-2 number, since 2×25690000² = 1319952200000000, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25690003) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 69817 + ... + 70183.

Almost surely, 2^25690000 is an apocalyptic number.

25690000 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 25690000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35638592).

25690000 is an abundant number, since it is smaller than the sum of its proper divisors (45587184).

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

25690000 is an equidigital number, since it uses as much as digits as its factorization.

25690000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 402 (or 381 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 25690000 is about 5068.5303589897. The cubic root of 25690000 is about 295.0674938931.

Adding to 25690000 its reverse (9652), we get a palindrome (25699652).

It can be divided in two parts, 256 and 90000, that multiplied together give a square (23040000 = 4800²).

The spelling of 25690000 in words is "twenty-five million, six hundred ninety thousand".