25896720640 has 72 divisors (see below), whose sum is σ = 70892297280. Its totient is φ = 8878872576.

The previous prime is 25896720601. The next prime is 25896720659. The reversal of 25896720640 is 4602769852.

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

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 7 ways as a sum of consecutive naturals, for example, 1436170 + ... + 1454089.

It is an arithmetic number, because the mean of its divisors is an integer number (984615240).

Almost surely, 2^25896720640 is an apocalyptic number.

25896720640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25896720640 is an abundant number, since it is smaller than the sum of its proper divisors (44995576640).

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

25896720640 is an equidigital number, since it uses as much as digits as its factorization.

25896720640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2890287 (or 2890273 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 49.

The spelling of 25896720640 in words is "twenty-five billion, eight hundred ninety-six million, seven hundred twenty thousand, six hundred forty".