28762729 has 4 divisors (see below), whose sum is σ = 29305476. Its totient is φ = 28219984.

The previous prime is 28762711. The next prime is 28762733. The reversal of 28762729 is 92726782.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 92726782 = 2 ⋅46363391.

It can be written as a sum of positive squares in 2 ways, for example, as 9753129 + 19009600 = 3123^2 + 4360^2 .

It is a cyclic number.

It is not a de Polignac number, because 28762729 - 2⁵ = 28762697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28762709) 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, 271294 + ... + 271399.

It is an arithmetic number, because the mean of its divisors is an integer number (7326369).

Almost surely, 2^28762729 is an apocalyptic number.

It is an amenable number.

28762729 is a deficient number, since it is larger than the sum of its proper divisors (542747).

28762729 is an equidigital number, since it uses as much as digits as its factorization.

28762729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 542746.

The product of its digits is 169344, while the sum is 43.

The square root of 28762729 is about 5363.0895013975. The cubic root of 28762729 is about 306.3914884744.

The spelling of 28762729 in words is "twenty-eight million, seven hundred sixty-two thousand, seven hundred twenty-nine".