28947916 has 24 divisors (see below), whose sum is σ = 53277840. Its totient is φ = 13742400.

The previous prime is 28947883. The next prime is 28947943. The reversal of 28947916 is 61974982.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5031 + ... + 9121.

It is an arithmetic number, because the mean of its divisors is an integer number (2219910).

Almost surely, 2^28947916 is an apocalyptic number.

It is an amenable number.

28947916 is a deficient number, since it is larger than the sum of its proper divisors (24329924).

28947916 is a wasteful number, since it uses less digits than its factorization.

28947916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4185 (or 4183 counting only the distinct ones).

The product of its digits is 217728, while the sum is 46.

The square root of 28947916 is about 5380.3267558764. The cubic root of 28947916 is about 307.0476429789.

It can be divided in two parts, 289 and 47916, that added together give a triangular number (48205 = T₃₁₀).

The spelling of 28947916 in words is "twenty-eight million, nine hundred forty-seven thousand, nine hundred sixteen".