276728399 has 4 divisors (see below), whose sum is σ = 278040120. Its totient is φ = 275416680.

The previous prime is 276728383. The next prime is 276728401. The reversal of 276728399 is 993827672.

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 276728399 - 2⁴ = 276728383 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 276728399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (276758399) 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, 655544 + ... + 655965.

It is an arithmetic number, because the mean of its divisors is an integer number (69510030).

Almost surely, 2^276728399 is an apocalyptic number.

276728399 is a deficient number, since it is larger than the sum of its proper divisors (1311721).

276728399 is a wasteful number, since it uses less digits than its factorization.

276728399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1311720.

The product of its digits is 2286144, while the sum is 53.

The square root of 276728399 is about 16635.1555147525. The cubic root of 276728399 is about 651.6552675651.

The spelling of 276728399 in words is "two hundred seventy-six million, seven hundred twenty-eight thousand, three hundred ninety-nine".