28949047 has 4 divisors (see below), whose sum is σ = 29947320. Its totient is φ = 27950776.

The previous prime is 28949029. The next prime is 28949051. The reversal of 28949047 is 74094982.

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

It is a cyclic number.

It is not a de Polignac number, because 28949047 - 2¹¹ = 28946999 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28948994 and 28949012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28949087) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 499093 + ... + 499150.

It is an arithmetic number, because the mean of its divisors is an integer number (7486830).

Almost surely, 2^28949047 is an apocalyptic number.

28949047 is a deficient number, since it is larger than the sum of its proper divisors (998273).

28949047 is an equidigital number, since it uses as much as digits as its factorization.

28949047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 998272.

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 28949047 is about 5380.4318599904. The cubic root of 28949047 is about 307.0516417280.

The spelling of 28949047 in words is "twenty-eight million, nine hundred forty-nine thousand, forty-seven".