25705504720 has 80 divisors (see below), whose sum is σ = 71272938240. Its totient is φ = 8430124032.

The previous prime is 25705504717. The next prime is 25705504733. The reversal of 25705504720 is 2740550752.

It is a tau number, because it is divible by the number of its divisors (80).

It is a self number, because there is not a number n which added to its sum of digits gives 25705504720.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 985005 + ... + 1010764.

It is an arithmetic number, because the mean of its divisors is an integer number (890911728).

Almost surely, 2^25705504720 is an apocalyptic number.

25705504720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25705504720 is an abundant number, since it is smaller than the sum of its proper divisors (45567433520).

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

25705504720 is a wasteful number, since it uses less digits than its factorization.

25705504720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1995812 (or 1995806 counting only the distinct ones).

The product of its (nonzero) digits is 98000, while the sum is 37.

The spelling of 25705504720 in words is "twenty-five billion, seven hundred five million, five hundred four thousand, seven hundred twenty".