25264639 has 4 divisors (see below), whose sum is σ = 25281256. Its totient is φ = 25248024.

The previous prime is 25264627. The next prime is 25264663. The reversal of 25264639 is 93646252.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 25264639 - 2¹³ = 25256447 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 25264598 and 25264607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25264739) 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 3 ways as a sum of consecutive naturals, for example, 5769 + ... + 9154.

It is an arithmetic number, because the mean of its divisors is an integer number (6320314).

Almost surely, 2^25264639 is an apocalyptic number.

25264639 is a deficient number, since it is larger than the sum of its proper divisors (16617).

25264639 is a wasteful number, since it uses less digits than its factorization.

25264639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16616.

The product of its digits is 77760, while the sum is 37.

The square root of 25264639 is about 5026.3942344388. The cubic root of 25264639 is about 293.4299000532.

The spelling of 25264639 in words is "twenty-five million, two hundred sixty-four thousand, six hundred thirty-nine".