25720055 has 4 divisors (see below), whose sum is σ = 30864072. Its totient is φ = 20576040.

The previous prime is 25720039. The next prime is 25720061. The reversal of 25720055 is 55002752.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 25720055 - 2⁴ = 25720039 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2572001 + ... + 2572010.

It is an arithmetic number, because the mean of its divisors is an integer number (7716018).

Almost surely, 2^25720055 is an apocalyptic number.

25720055 is a deficient number, since it is larger than the sum of its proper divisors (5144017).

25720055 is an equidigital number, since it uses as much as digits as its factorization.

25720055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5144016.

The product of its (nonzero) digits is 3500, while the sum is 26.

The square root of 25720055 is about 5071.4943557102. The cubic root of 25720055 is about 295.1825165663.

The spelling of 25720055 in words is "twenty-five million, seven hundred twenty thousand, fifty-five".