276428729 has 4 divisors (see below), whose sum is σ = 276895476. Its totient is φ = 275961984.

The previous prime is 276428717. The next prime is 276428771. The reversal of 276428729 is 927824672.

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

It can be written as a sum of positive squares in 2 ways, for example, as 115519504 + 160909225 = 10748^2 + 12685^2 .

It is a cyclic number.

It is not a de Polignac number, because 276428729 - 2¹² = 276424633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (276428129) 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, 232484 + ... + 233669.

It is an arithmetic number, because the mean of its divisors is an integer number (69223869).

Almost surely, 2^276428729 is an apocalyptic number.

It is an amenable number.

276428729 is a deficient number, since it is larger than the sum of its proper divisors (466747).

276428729 is an equidigital number, since it uses as much as digits as its factorization.

276428729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 466746.

The product of its digits is 677376, while the sum is 47.

The square root of 276428729 is about 16626.1459454679. The cubic root of 276428729 is about 651.4199561340.

The spelling of 276428729 in words is "two hundred seventy-six million, four hundred twenty-eight thousand, seven hundred twenty-nine".