28947347 has 32 divisors (see below), whose sum is σ = 35804160. Its totient is φ = 23051520.

The previous prime is 28947341. The next prime is 28947361. The reversal of 28947347 is 74374982.

It is a cyclic number.

It is not a de Polignac number, because 28947347 - 2⁸ = 28947091 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28947298 and 28947307.

It is not an unprimeable number, because it can be changed into a prime (28947341) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 396503 + ... + 396575.

It is an arithmetic number, because the mean of its divisors is an integer number (1118880).

Almost surely, 2^28947347 is an apocalyptic number.

28947347 is a deficient number, since it is larger than the sum of its proper divisors (6856813).

28947347 is a wasteful number, since it uses less digits than its factorization.

28947347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203.

The product of its digits is 338688, while the sum is 44.

The square root of 28947347 is about 5380.2738777873. The cubic root of 28947347 is about 307.0456311904.

The spelling of 28947347 in words is "twenty-eight million, nine hundred forty-seven thousand, three hundred forty-seven".