28948019 has 4 divisors (see below), whose sum is σ = 28969320. Its totient is φ = 28926720.

The previous prime is 28947979. The next prime is 28948021. The reversal of 28948019 is 91084982.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28948019 is a prime.

It is a super-2 number, since 2×28948019² = 1675975608048722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28948069) 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, 8462 + ... + 11379.

It is an arithmetic number, because the mean of its divisors is an integer number (7242330).

Almost surely, 2^28948019 is an apocalyptic number.

28948019 is a deficient number, since it is larger than the sum of its proper divisors (21301).

28948019 is a wasteful number, since it uses less digits than its factorization.

28948019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21300.

The product of its (nonzero) digits is 41472, while the sum is 41.

The square root of 28948019 is about 5380.3363277773. The cubic root of 28948019 is about 307.0480071487.

The spelling of 28948019 in words is "twenty-eight million, nine hundred forty-eight thousand, nineteen".