828271643 has 4 divisors (see below), whose sum is σ = 828660288. Its totient is φ = 827883000.

The previous prime is 828271601. The next prime is 828271649. The reversal of 828271643 is 346172828.

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 828271643 - 2⁸ = 828271387 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 828271643.

It is not an unprimeable number, because it can be changed into a prime (828271649) 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, 191108 + ... + 195393.

It is an arithmetic number, because the mean of its divisors is an integer number (207165072).

Almost surely, 2^828271643 is an apocalyptic number.

828271643 is a deficient number, since it is larger than the sum of its proper divisors (388645).

828271643 is a wasteful number, since it uses less digits than its factorization.

828271643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388644.

The product of its digits is 129024, while the sum is 41.

The square root of 828271643 is about 28779.7088762204. The cubic root of 828271643 is about 939.1268650208.

The spelling of 828271643 in words is "eight hundred twenty-eight million, two hundred seventy-one thousand, six hundred forty-three".