25809475 has 12 divisors (see below), whose sum is σ = 32127904. Its totient is φ = 20567520.

The previous prime is 25809457. The next prime is 25809479. The reversal of 25809475 is 57490852.

It is a de Polignac number, because none of the positive numbers 2^k-25809475 is a prime.

It is a super-2 number, since 2×25809475² = 1332257999551250, which contains 22 as substring.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25809479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5062 + ... + 8788.

Almost surely, 2^25809475 is an apocalyptic number.

25809475 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

25809475 is a deficient number, since it is larger than the sum of its proper divisors (6318429).

25809475 is a wasteful number, since it uses less digits than its factorization.

25809475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4014 (or 4009 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 40.

The square root of 25809475 is about 5080.3026484650. The cubic root of 25809475 is about 295.5242044109.

The spelling of 25809475 in words is "twenty-five million, eight hundred nine thousand, four hundred seventy-five".