28303918 has 4 divisors (see below), whose sum is σ = 42455880. Its totient is φ = 14151958.

The previous prime is 28303903. The next prime is 28303943. The reversal of 28303918 is 81930382.

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

It is a super-2 number, since 2×28303918² = 1602223548301448, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7075978 + ... + 7075981.

It is an arithmetic number, because the mean of its divisors is an integer number (10613970).

Almost surely, 2^28303918 is an apocalyptic number.

28303918 is a deficient number, since it is larger than the sum of its proper divisors (14151962).

28303918 is a wasteful number, since it uses less digits than its factorization.

28303918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14151961.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 28303918 is about 5320.1426672600. The cubic root of 28303918 is about 304.7536055365.

The spelling of 28303918 in words is "twenty-eight million, three hundred three thousand, nine hundred eighteen".