25730081 has 6 divisors (see below), whose sum is σ = 27861750. Its totient is φ = 23750688.

The previous prime is 25730071. The next prime is 25730087. The reversal of 25730081 is 18003752.

It can be written as a sum of positive squares in 3 ways, for example, as 640000 + 25090081 = 800^2 + 5009^2 .

It is not a de Polignac number, because 25730081 - 2⁶ = 25730017 is a prime.

It is a super-2 number, since 2×25730081² = 1324074136533122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25730081.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25730087) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 75956 + ... + 76293.

It is an arithmetic number, because the mean of its divisors is an integer number (4643625).

Almost surely, 2^25730081 is an apocalyptic number.

It is an amenable number.

25730081 is a deficient number, since it is larger than the sum of its proper divisors (2131669).

25730081 is a wasteful number, since it uses less digits than its factorization.

25730081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152275 (or 152262 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 25730081 is about 5072.4827254511. The cubic root of 25730081 is about 295.2208668659.

The spelling of 25730081 in words is "twenty-five million, seven hundred thirty thousand, eighty-one".