28980947 has 16 divisors (see below), whose sum is σ = 31860000. Its totient is φ = 26256384.

The previous prime is 28980907. The next prime is 28980949. The reversal of 28980947 is 74908982.

It is a cyclic number.

It is not a de Polignac number, because 28980947 - 2¹² = 28976851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28980949) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 81923 + ... + 82275.

It is an arithmetic number, because the mean of its divisors is an integer number (1991250).

Almost surely, 2^28980947 is an apocalyptic number.

28980947 is a deficient number, since it is larger than the sum of its proper divisors (2879053).

28980947 is a wasteful number, since it uses less digits than its factorization.

28980947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 550.

The product of its (nonzero) digits is 290304, while the sum is 47.

The square root of 28980947 is about 5383.3954898372. The cubic root of 28980947 is about 307.1643840896.

The spelling of 28980947 in words is "twenty-eight million, nine hundred eighty thousand, nine hundred forty-seven".