25615540 has 24 divisors (see below), whose sum is σ = 53962272. Its totient is φ = 10213920.

The previous prime is 25615523. The next prime is 25615559. The reversal of 25615540 is 4551652.

It is a junction number, because it is equal to n+sod(n) for n = 25615499 and 25615508.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 5095 + ... + 8785.

It is an arithmetic number, because the mean of its divisors is an integer number (2248428).

Almost surely, 2^25615540 is an apocalyptic number.

25615540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25615540 is an abundant number, since it is smaller than the sum of its proper divisors (28346732).

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

25615540 is a wasteful number, since it uses less digits than its factorization.

25615540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4047 (or 4045 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 28.

The square root of 25615540 is about 5061.1797043772. The cubic root of 25615540 is about 294.7821430884.

The spelling of 25615540 in words is "twenty-five million, six hundred fifteen thousand, five hundred forty".