25520257 has 8 divisors (see below), whose sum is σ = 29293056. Its totient is φ = 21779232.

The previous prime is 25520221. The next prime is 25520267. The reversal of 25520257 is 75202552.

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 25520257 - 2⁷ = 25520129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25520267) 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, 6193 + ... + 9454.

It is an arithmetic number, because the mean of its divisors is an integer number (3661632).

Almost surely, 2^25520257 is an apocalyptic number.

It is an amenable number.

25520257 is a deficient number, since it is larger than the sum of its proper divisors (3772799).

25520257 is a wasteful number, since it uses less digits than its factorization.

25520257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15887.

The product of its (nonzero) digits is 7000, while the sum is 28.

The square root of 25520257 is about 5051.7578128806. The cubic root of 25520257 is about 294.4161852182.

The spelling of 25520257 in words is "twenty-five million, five hundred twenty thousand, two hundred fifty-seven".