25000640 has 56 divisors (see below), whose sum is σ = 68043552. Its totient is φ = 8570880.

The previous prime is 25000627. The next prime is 25000643. The reversal of 25000640 is 4600052.

It is a tau number, because it is divible by the number of its divisors (56).

It is not an unprimeable number, because it can be changed into a prime (25000643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3341 + ... + 7820.

Almost surely, 2^25000640 is an apocalyptic number.

25000640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25000640 is an abundant number, since it is smaller than the sum of its proper divisors (43042912).

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

25000640 is a wasteful number, since it uses less digits than its factorization.

25000640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11185 (or 11175 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 25000640 is about 5000.0639995904. The cubic root of 25000640 is about 292.4042689618.

Adding to 25000640 its reverse (4600052), we get a palindrome (29600692).

It can be divided in two parts, 25000 and 640, that multiplied together give a square (16000000 = 4000²).

The spelling of 25000640 in words is "twenty-five million, six hundred forty", and thus it is an aban number.