25724731 has 4 divisors (see below), whose sum is σ = 26420032. Its totient is φ = 25029432.

The previous prime is 25724719. The next prime is 25724749. The reversal of 25724731 is 13742752.

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

It is a cyclic number.

It is not a de Polignac number, because 25724731 - 2¹³ = 25716539 is a prime.

It is a super-2 number, since 2×25724731² = 1323523570044722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25724693 and 25724702.

It is not an unprimeable number, because it can be changed into a prime (25824731) 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, 347595 + ... + 347668.

It is an arithmetic number, because the mean of its divisors is an integer number (6605008).

Almost surely, 2^25724731 is an apocalyptic number.

25724731 is a deficient number, since it is larger than the sum of its proper divisors (695301).

25724731 is an equidigital number, since it uses as much as digits as its factorization.

25724731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 695300.

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

The square root of 25724731 is about 5071.9553428633. The cubic root of 25724731 is about 295.2004039024.

The spelling of 25724731 in words is "twenty-five million, seven hundred twenty-four thousand, seven hundred thirty-one".