25640455 has 16 divisors (see below), whose sum is σ = 31397760. Its totient is φ = 20097792.

The previous prime is 25640453. The next prime is 25640467. The reversal of 25640455 is 55404652.

It is a cyclic number.

It is not a de Polignac number, because 25640455 - 2¹ = 25640453 is a prime.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25640453) 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 15 ways as a sum of consecutive naturals, for example, 69682 + ... + 70048.

It is an arithmetic number, because the mean of its divisors is an integer number (1962360).

Almost surely, 2^25640455 is an apocalyptic number.

25640455 is a deficient number, since it is larger than the sum of its proper divisors (5757305).

25640455 is a wasteful number, since it uses less digits than its factorization.

25640455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 618.

The product of its (nonzero) digits is 24000, while the sum is 31.

The square root of 25640455 is about 5063.6404888183. The cubic root of 25640455 is about 294.8776855750.

The spelling of 25640455 in words is "twenty-five million, six hundred forty thousand, four hundred fifty-five".