25724778 has 8 divisors (see below), whose sum is σ = 51449568. Its totient is φ = 8574924.

The previous prime is 25724773. The next prime is 25724807. The reversal of 25724778 is 87742752.

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

25724778 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (25724773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2143726 + ... + 2143737.

It is an arithmetic number, because the mean of its divisors is an integer number (6431196).

Almost surely, 2^25724778 is an apocalyptic number.

25724778 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25724778 is a wasteful number, since it uses less digits than its factorization.

25724778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4287468.

The product of its digits is 219520, while the sum is 42.

The square root of 25724778 is about 5071.9599761828. The cubic root of 25724778 is about 295.2005836829.

The spelling of 25724778 in words is "twenty-five million, seven hundred twenty-four thousand, seven hundred seventy-eight".