25515520 has 40 divisors (see below), whose sum is σ = 61183584. Its totient is φ = 10205184.

The previous prime is 25515509. The next prime is 25515551. The reversal of 25515520 is 2551552.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2424 + ... + 7543.

Almost surely, 2^25515520 is an apocalyptic number.

25515520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25515520 is an abundant number, since it is smaller than the sum of its proper divisors (35668064).

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

25515520 is an frugal number, since it uses more digits than its factorization.

25515520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9990 (or 9974 counting only the distinct ones).

The product of its (nonzero) digits is 2500, while the sum is 25.

The square root of 25515520 is about 5051.2889444180. The cubic root of 25515520 is about 294.3979678499.

The spelling of 25515520 in words is "twenty-five million, five hundred fifteen thousand, five hundred twenty".