28723858 has 16 divisors (see below), whose sum is σ = 45508320. Its totient is φ = 13559616.

The previous prime is 28723853. The next prime is 28723867. The reversal of 28723858 is 85832782.

It is not an unprimeable number, because it can be changed into a prime (28723853) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11685 + ... + 13927.

It is an arithmetic number, because the mean of its divisors is an integer number (2844270).

Almost surely, 2^28723858 is an apocalyptic number.

28723858 is a deficient number, since it is larger than the sum of its proper divisors (16784462).

28723858 is a wasteful number, since it uses less digits than its factorization.

28723858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2601.

The product of its digits is 215040, while the sum is 43.

The square root of 28723858 is about 5359.4643389055. The cubic root of 28723858 is about 306.2534033774.

It can be divided in two parts, 287238 and 58, that added together give a square (287296 = 536²).

The spelling of 28723858 in words is "twenty-eight million, seven hundred twenty-three thousand, eight hundred fifty-eight".