25515945 has 128 divisors (see below), whose sum is σ = 58490880. Its totient is φ = 10264320.

The previous prime is 25515937. The next prime is 25515967. The reversal of 25515945 is 54951552.

It is not a de Polignac number, because 25515945 - 2³ = 25515937 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 380802 + ... + 380868.

It is an arithmetic number, because the mean of its divisors is an integer number (456960).

Almost surely, 2^25515945 is an apocalyptic number.

It is an amenable number.

25515945 is an abundant number, since it is smaller than the sum of its proper divisors (32974935).

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

25515945 is a wasteful number, since it uses less digits than its factorization.

25515945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132 (or 126 counting only the distinct ones).

The product of its digits is 45000, while the sum is 36.

The square root of 25515945 is about 5051.3310127134. The cubic root of 25515945 is about 294.3996023902.

The spelling of 25515945 in words is "twenty-five million, five hundred fifteen thousand, nine hundred forty-five".