25721473 has 4 divisors (see below), whose sum is σ = 26348868. Its totient is φ = 25094080.

The previous prime is 25721461. The next prime is 25721503. The reversal of 25721473 is 37412752.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4717584 + 21003889 = 2172^2 + 4583^2 .

It is a cyclic number.

It is not a de Polignac number, because 25721473 - 2⁵ = 25721441 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25781473) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 313636 + ... + 313717.

It is an arithmetic number, because the mean of its divisors is an integer number (6587217).

Almost surely, 2^25721473 is an apocalyptic number.

It is an amenable number.

25721473 is a deficient number, since it is larger than the sum of its proper divisors (627395).

25721473 is an equidigital number, since it uses as much as digits as its factorization.

25721473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 627394.

The product of its digits is 11760, while the sum is 31.

The square root of 25721473 is about 5071.6341547868. The cubic root of 25721473 is about 295.1879411415.

The spelling of 25721473 in words is "twenty-five million, seven hundred twenty-one thousand, four hundred seventy-three".