28030913 has 8 divisors (see below), whose sum is σ = 29001216. Its totient is φ = 27064800.

The previous prime is 28030889. The next prime is 28030957. The reversal of 28030913 is 31903082.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28030913 - 2⁸ = 28030657 is a prime.

It is a super-2 number, since 2×28030913² = 1571464167227138, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28030213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18845 + ... + 20277.

It is an arithmetic number, because the mean of its divisors is an integer number (3625152).

Almost surely, 2^28030913 is an apocalyptic number.

It is an amenable number.

28030913 is a deficient number, since it is larger than the sum of its proper divisors (970303).

28030913 is a wasteful number, since it uses less digits than its factorization.

28030913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2095.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 28030913 is about 5294.4228202893. The cubic root of 28030913 is about 303.7706061766.

Adding to 28030913 its reverse (31903082), we get a palindrome (59933995).

The spelling of 28030913 in words is "twenty-eight million, thirty thousand, nine hundred thirteen".