25724457 has 24 divisors (see below), whose sum is σ = 40772160. Its totient is φ = 15499680.

The previous prime is 25724443. The next prime is 25724467. The reversal of 25724457 is 75442752.

It is a happy number.

It is not a de Polignac number, because 25724457 - 2¹⁴ = 25708073 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (25724407) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18844 + ... + 20162.

It is an arithmetic number, because the mean of its divisors is an integer number (1698840).

Almost surely, 2^25724457 is an apocalyptic number.

It is an amenable number.

25724457 is a deficient number, since it is larger than the sum of its proper divisors (15047703).

25724457 is a wasteful number, since it uses less digits than its factorization.

25724457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1533 (or 1530 counting only the distinct ones).

The product of its digits is 78400, while the sum is 36.

The square root of 25724457 is about 5071.9283315126. The cubic root of 25724457 is about 295.1993558163.

The spelling of 25724457 in words is "twenty-five million, seven hundred twenty-four thousand, four hundred fifty-seven".