25600000 has 84 divisors (see below), whose sum is σ = 63991998. Its totient is φ = 10240000.

The previous prime is 25599991. The next prime is 25600013. The reversal of 25600000 is 652.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 3 ways, for example, as 36864 + 25563136 = 192^2 + 5056^2 .

It is an enlightened number because it begins with the concatenation of its prime factors (25).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5119998 + ... + 5120002.

Almost surely, 2^25600000 is an apocalyptic number.

25600000 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 25600000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31995999).

25600000 is an abundant number, since it is smaller than the sum of its proper divisors (38391998).

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

25600000 is an frugal number, since it uses more digits than its factorization.

25600000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51 (or 7 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 13.

The square root of 25600000 is about 5059.6442562694. The cubic root of 25600000 is about 294.7225198912.

Adding to 25600000 its reverse (652), we get a palindrome (25600652).

The spelling of 25600000 in words is "twenty-five million, six hundred thousand".