25830505 has 4 divisors (see below), whose sum is σ = 30996612. Its totient is φ = 20664400.

The previous prime is 25830499. The next prime is 25830523. The reversal of 25830505 is 50503852.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14017536 + 11812969 = 3744^2 + 3437^2 .

It is a de Polignac number, because none of the positive numbers 2^k-25830505 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian 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, 2583046 + ... + 2583055.

It is an arithmetic number, because the mean of its divisors is an integer number (7749153).

Almost surely, 2^25830505 is an apocalyptic number.

It is an amenable number.

25830505 is a deficient number, since it is larger than the sum of its proper divisors (5166107).

25830505 is an equidigital number, since it uses as much as digits as its factorization.

25830505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5166106.

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

The square root of 25830505 is about 5082.3719855989. The cubic root of 25830505 is about 295.6044486724.

It can be divided in two parts, 25830 and 505, that added together give a triangular number (26335 = T₂₂₉).

The spelling of 25830505 in words is "twenty-five million, eight hundred thirty thousand, five hundred five".