265328639 has 4 divisors (see below), whose sum is σ = 280936224. Its totient is φ = 249721056.

The previous prime is 265328617. The next prime is 265328681. The reversal of 265328639 is 936823562.

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 265328639 - 2⁸ = 265328383 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 265328639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (265328699) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7803767 + ... + 7803800.

It is an arithmetic number, because the mean of its divisors is an integer number (70234056).

Almost surely, 2^265328639 is an apocalyptic number.

265328639 is a deficient number, since it is larger than the sum of its proper divisors (15607585).

265328639 is a wasteful number, since it uses less digits than its factorization.

265328639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15607584.

The product of its digits is 466560, while the sum is 44.

The square root of 265328639 is about 16288.9115351518. The cubic root of 265328639 is about 642.5812412221.

The spelling of 265328639 in words is "two hundred sixty-five million, three hundred twenty-eight thousand, six hundred thirty-nine".