25620257 has 8 divisors (see below), whose sum is σ = 27682536. Its totient is φ = 23571072.

The previous prime is 25620239. The next prime is 25620263. The reversal of 25620257 is 75202652.

It can be written as a sum of positive squares in 4 ways, for example, as 57121 + 25563136 = 239^2 + 5056^2 .

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 25620257 - 2⁶ = 25620193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25620277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1013 + ... + 7229.

It is an arithmetic number, because the mean of its divisors is an integer number (3460317).

Almost surely, 2^25620257 is an apocalyptic number.

It is an amenable number.

25620257 is a deficient number, since it is larger than the sum of its proper divisors (2062279).

25620257 is a wasteful number, since it uses less digits than its factorization.

25620257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6547.

The product of its (nonzero) digits is 8400, while the sum is 29.

The square root of 25620257 is about 5061.6456810014. The cubic root of 25620257 is about 294.8002362983.

The spelling of 25620257 in words is "twenty-five million, six hundred twenty thousand, two hundred fifty-seven".