28100913 has 8 divisors (see below), whose sum is σ = 38760000. Its totient is φ = 18087888.

The previous prime is 28100893. The next prime is 28100921. The reversal of 28100913 is 31900182.

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

It is not a de Polignac number, because 28100913 - 2¹⁰ = 28099889 is a prime.

It is a super-2 number, since 2×28100913² = 1579322622867138, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28100213) 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, 161413 + ... + 161586.

It is an arithmetic number, because the mean of its divisors is an integer number (4845000).

Almost surely, 2^28100913 is an apocalyptic number.

It is an amenable number.

28100913 is a deficient number, since it is larger than the sum of its proper divisors (10659087).

28100913 is a wasteful number, since it uses less digits than its factorization.

28100913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323031.

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 28100913 is about 5301.0294283280. The cubic root of 28100913 is about 304.0232589833.

The spelling of 28100913 in words is "twenty-eight million, one hundred thousand, nine hundred thirteen".