25535540 has 12 divisors (see below), whose sum is σ = 53624676. Its totient is φ = 10214208.

The previous prime is 25535533. The next prime is 25535557. The reversal of 25535540 is 4553552.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 6421156 + 19114384 = 2534^2 + 4372^2 .

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, 638369 + ... + 638408.

It is an arithmetic number, because the mean of its divisors is an integer number (4468723).

Almost surely, 2^25535540 is an apocalyptic number.

25535540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25535540 is an abundant number, since it is smaller than the sum of its proper divisors (28089136).

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

25535540 is a wasteful number, since it uses less digits than its factorization.

25535540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1276786 (or 1276784 counting only the distinct ones).

The product of its (nonzero) digits is 15000, while the sum is 29.

The square root of 25535540 is about 5053.2702282779. The cubic root of 25535540 is about 294.4749446142.

The spelling of 25535540 in words is "twenty-five million, five hundred thirty-five thousand, five hundred forty".