28855723 has 4 divisors (see below), whose sum is σ = 31075408. Its totient is φ = 26636040.

The previous prime is 28855663. The next prime is 28855741. The reversal of 28855723 is 32755882.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32755882 = 2 ⋅16377941.

It is a cyclic number.

It is not a de Polignac number, because 28855723 - 2¹⁷ = 28724651 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28855753) 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, 1109823 + ... + 1109848.

It is an arithmetic number, because the mean of its divisors is an integer number (7768852).

Almost surely, 2^28855723 is an apocalyptic number.

28855723 is a deficient number, since it is larger than the sum of its proper divisors (2219685).

28855723 is a wasteful number, since it uses less digits than its factorization.

28855723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2219684.

The product of its digits is 134400, while the sum is 40.

The square root of 28855723 is about 5371.7523211704. The cubic root of 28855723 is about 306.7213356905.

The spelling of 28855723 in words is "twenty-eight million, eight hundred fifty-five thousand, seven hundred twenty-three".