25724321 has 8 divisors (see below), whose sum is σ = 29530560. Its totient is φ = 21950928.

The previous prime is 25724317. The next prime is 25724333. The reversal of 25724321 is 12342752.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25724321 - 2² = 25724317 is a prime.

It is a super-2 number, since 2×25724321² = 1323481381822082, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25724311) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6506 + ... + 9683.

It is an arithmetic number, because the mean of its divisors is an integer number (3691320).

Almost surely, 2^25724321 is an apocalyptic number.

It is an amenable number.

25724321 is a deficient number, since it is larger than the sum of its proper divisors (3806239).

25724321 is a wasteful number, since it uses less digits than its factorization.

25724321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16423.

The product of its digits is 3360, while the sum is 26.

The square root of 25724321 is about 5071.9149243654. The cubic root of 25724321 is about 295.1988355957.

The spelling of 25724321 in words is "twenty-five million, seven hundred twenty-four thousand, three hundred twenty-one".