25690240 has 64 divisors (see below), whose sum is σ = 62075160. Its totient is φ = 10166272.

The previous prime is 25690229. The next prime is 25690277. The reversal of 25690240 is 4209652.

It can be written as a sum of positive squares in 4 ways, for example, as 25160256 + 529984 = 5016^2 + 728^2 .

It is a tau number, because it is divible by the number of its divisors (64).

It is a junction number, because it is equal to n+sod(n) for n = 25690199 and 25690208.

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, 87534 + ... + 87826.

Almost surely, 2^25690240 is an apocalyptic number.

25690240 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 25690240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31037580).

25690240 is an abundant number, since it is smaller than the sum of its proper divisors (36384920).

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

25690240 is a wasteful number, since it uses less digits than its factorization.

25690240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 449 (or 437 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 25690240 is about 5068.5540344363. The cubic root of 25690240 is about 295.0684127458.

Adding to 25690240 its reverse (4209652), we get a palindrome (29899892).

The spelling of 25690240 in words is "twenty-five million, six hundred ninety thousand, two hundred forty".