28771723 has 4 divisors (see below), whose sum is σ = 28998400. Its totient is φ = 28545048.

The previous prime is 28771697. The next prime is 28771727. The reversal of 28771723 is 32717782.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32717782 = 2 ⋅16358891.

It is a cyclic number.

It is not a de Polignac number, because 28771723 - 2¹³ = 28763531 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28771727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113148 + ... + 113401.

It is an arithmetic number, because the mean of its divisors is an integer number (7249600).

Almost surely, 2^28771723 is an apocalyptic number.

28771723 is a deficient number, since it is larger than the sum of its proper divisors (226677).

28771723 is a wasteful number, since it uses less digits than its factorization.

28771723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226676.

The product of its digits is 32928, while the sum is 37.

The square root of 28771723 is about 5363.9279450791. The cubic root of 28771723 is about 306.4234209783.

It can be divided in two parts, 287 and 71723, that added together give a triangular number (72010 = T₃₇₉).

The spelling of 28771723 in words is "twenty-eight million, seven hundred seventy-one thousand, seven hundred twenty-three".