25900640 has 24 divisors (see below), whose sum is σ = 61190640. Its totient is φ = 10360192.

The previous prime is 25900631. The next prime is 25900681. The reversal of 25900640 is 4600952.

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 80780 + ... + 81099.

It is an arithmetic number, because the mean of its divisors is an integer number (2549610).

Almost surely, 2^25900640 is an apocalyptic number.

25900640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25900640 is an abundant number, since it is smaller than the sum of its proper divisors (35290000).

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

25900640 is a wasteful number, since it uses less digits than its factorization.

25900640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161894 (or 161886 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 25900640 is about 5089.2671378107. The cubic root of 25900640 is about 295.8717486758.

The spelling of 25900640 in words is "twenty-five million, nine hundred thousand, six hundred forty".