25901780 has 12 divisors (see below), whose sum is σ = 54393780. Its totient is φ = 10360704.

The previous prime is 25901699. The next prime is 25901783. The reversal of 25901780 is 8710952.

It can be written as a sum of positive squares in 2 ways, for example, as 7118224 + 18783556 = 2668^2 + 4334^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25901783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 647525 + ... + 647564.

It is an arithmetic number, because the mean of its divisors is an integer number (4532815).

Almost surely, 2^25901780 is an apocalyptic number.

25901780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25901780 is an abundant number, since it is smaller than the sum of its proper divisors (28492000).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25901780 is a wasteful number, since it uses less digits than its factorization.

25901780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1295098 (or 1295096 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 32.

The square root of 25901780 is about 5089.3791369871. The cubic root of 25901780 is about 295.8760894803.

The spelling of 25901780 in words is "twenty-five million, nine hundred one thousand, seven hundred eighty".