28123958 has 4 divisors (see below), whose sum is σ = 42185940. Its totient is φ = 14061978.

The previous prime is 28123937. The next prime is 28123993. The reversal of 28123958 is 85932182.

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

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 7030988 + ... + 7030991.

It is an arithmetic number, because the mean of its divisors is an integer number (10546485).

Almost surely, 2^28123958 is an apocalyptic number.

28123958 is a deficient number, since it is larger than the sum of its proper divisors (14061982).

28123958 is a wasteful number, since it uses less digits than its factorization.

28123958 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14061981.

The product of its digits is 34560, while the sum is 38.

The square root of 28123958 is about 5303.2026172870. The cubic root of 28123958 is about 304.1063440852.

The spelling of 28123958 in words is "twenty-eight million, one hundred twenty-three thousand, nine hundred fifty-eight".