25064681 has 6 divisors (see below), whose sum is σ = 26626110. Its totient is φ = 23590016.

The previous prime is 25064639. The next prime is 25064693. The reversal of 25064681 is 18646052.

It can be written as a sum of positive squares in 3 ways, for example, as 11256025 + 13808656 = 3355^2 + 3716^2 .

It is not a de Polignac number, because 25064681 - 2⁶ = 25064617 is a prime.

It is a super-2 number, since 2×25064681² = 1256476467263522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25064581) 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, 43076 + ... + 43653.

It is an arithmetic number, because the mean of its divisors is an integer number (4437685).

Almost surely, 2^25064681 is an apocalyptic number.

It is an amenable number.

25064681 is a deficient number, since it is larger than the sum of its proper divisors (1561429).

25064681 is an equidigital number, since it uses as much as digits as its factorization.

25064681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86763 (or 86746 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 25064681 is about 5006.4639217715. The cubic root of 25064681 is about 292.6537278460.

The spelling of 25064681 in words is "twenty-five million, sixty-four thousand, six hundred eighty-one".