25720081 has 4 divisors (see below), whose sum is σ = 25736164. Its totient is φ = 25704000.

The previous prime is 25720073. The next prime is 25720087. The reversal of 25720081 is 18002752.

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 919681 + 24800400 = 959^2 + 4980^2 .

It is a cyclic number.

It is not a de Polignac number, because 25720081 - 2³ = 25720073 is a prime.

It is a super-2 number, since 2×25720081² = 1323045133293122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25720087) 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, 5340 + ... + 8941.

It is an arithmetic number, because the mean of its divisors is an integer number (6434041).

Almost surely, 2^25720081 is an apocalyptic number.

It is an amenable number.

25720081 is a deficient number, since it is larger than the sum of its proper divisors (16083).

25720081 is a wasteful number, since it uses less digits than its factorization.

25720081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16082.

The product of its (nonzero) digits is 1120, while the sum is 25.

The square root of 25720081 is about 5071.4969190565. The cubic root of 25720081 is about 295.1826160314.

The spelling of 25720081 in words is "twenty-five million, seven hundred twenty thousand, eighty-one".