25661072 has 10 divisors (see below), whose sum is σ = 49718358. Its totient is φ = 12830528.

The previous prime is 25661071. The next prime is 25661081. The reversal of 25661072 is 27016652.

It can be written as a sum of positive squares in only one way, i.e., 22619536 + 3041536 = 4756^2 + 1744^2 .

It is not an unprimeable number, because it can be changed into a prime (25661071) 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 as a sum of consecutive naturals, namely, 801893 + ... + 801924.

Almost surely, 2^25661072 is an apocalyptic number.

It is an amenable number.

25661072 is a deficient number, since it is larger than the sum of its proper divisors (24057286).

25661072 is a wasteful number, since it uses less digits than its factorization.

25661072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1603825 (or 1603819 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 25661072 is about 5065.6758680358. The cubic root of 25661072 is about 294.9566995720.

The spelling of 25661072 in words is "twenty-five million, six hundred sixty-one thousand, seventy-two".