25215740 has 24 divisors (see below), whose sum is σ = 57767472. Its totient is φ = 9169280.

The previous prime is 25215731. The next prime is 25215763. The reversal of 25215740 is 4751252.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57089 + ... + 57528.

It is an arithmetic number, because the mean of its divisors is an integer number (2406978).

Almost surely, 2^25215740 is an apocalyptic number.

25215740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25215740 is an abundant number, since it is smaller than the sum of its proper divisors (32551732).

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

25215740 is a wasteful number, since it uses less digits than its factorization.

25215740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114637 (or 114635 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 26.

The square root of 25215740 is about 5021.5276560027. The cubic root of 25215740 is about 293.2404693414.

Adding to 25215740 its reverse (4751252), we get a palindrome (29966992).

The spelling of 25215740 in words is "twenty-five million, two hundred fifteen thousand, seven hundred forty".