25781975 has 6 divisors (see below), whose sum is σ = 31969680. Its totient is φ = 20625560.

The previous prime is 25781963. The next prime is 25781999. The reversal of 25781975 is 57918752.

It is not a de Polignac number, because 25781975 - 2¹² = 25777879 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 515615 + ... + 515664.

It is an arithmetic number, because the mean of its divisors is an integer number (5328280).

Almost surely, 2^25781975 is an apocalyptic number.

25781975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

25781975 is a deficient number, since it is larger than the sum of its proper divisors (6187705).

25781975 is a wasteful number, since it uses less digits than its factorization.

25781975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1031289 (or 1031284 counting only the distinct ones).

The product of its digits is 176400, while the sum is 44.

The square root of 25781975 is about 5077.5953954603. The cubic root of 25781975 is about 295.4192067470.

The spelling of 25781975 in words is "twenty-five million, seven hundred eighty-one thousand, nine hundred seventy-five".