25009540 has 24 divisors (see below), whose sum is σ = 52803072. Its totient is φ = 9949920.

The previous prime is 25009511. The next prime is 25009541. The reversal of 25009540 is 4590052.

It is not an unprimeable number, because it can be changed into a prime (25009541) 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, 547 + ... + 7093.

It is an arithmetic number, because the mean of its divisors is an integer number (2200128).

Almost surely, 2^25009540 is an apocalyptic number.

25009540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25009540 is an abundant number, since it is smaller than the sum of its proper divisors (27793532).

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

25009540 is a wasteful number, since it uses less digits than its factorization.

25009540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6747 (or 6745 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 25009540 is about 5000.9539090058. The cubic root of 25009540 is about 292.4389625969.

Adding to 25009540 its reverse (4590052), we get a palindrome (29599592).

The spelling of 25009540 in words is "twenty-five million, nine thousand, five hundred forty".