25348640 has 24 divisors (see below), whose sum is σ = 59886540. Its totient is φ = 10139392.

The previous prime is 25348627. The next prime is 25348643. The reversal of 25348640 is 4684352.

It can be written as a sum of positive squares in 2 ways, for example, as 23001616 + 2347024 = 4796^2 + 1532^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 25348597 and 25348606.

It is not an unprimeable number, because it can be changed into a prime (25348643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79055 + ... + 79374.

Almost surely, 2^25348640 is an apocalyptic number.

25348640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25348640 is an abundant number, since it is smaller than the sum of its proper divisors (34537900).

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

25348640 is a wasteful number, since it uses less digits than its factorization.

25348640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158444 (or 158436 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 32.

The square root of 25348640 is about 5034.7432903774. The cubic root of 25348640 is about 293.7547432462.

The spelling of 25348640 in words is "twenty-five million, three hundred forty-eight thousand, six hundred forty".