28128910 has 16 divisors (see below), whose sum is σ = 50945616. Its totient is φ = 11181888.

The previous prime is 28128901. The next prime is 28128913. The reversal of 28128910 is 1982182.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28128913) 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, 6999 + ... + 10258.

It is an arithmetic number, because the mean of its divisors is an integer number (3184101).

Almost surely, 2^28128910 is an apocalyptic number.

28128910 is a deficient number, since it is larger than the sum of its proper divisors (22816706).

28128910 is a wasteful number, since it uses less digits than its factorization.

28128910 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17427.

The product of its (nonzero) digits is 2304, while the sum is 31.

The square root of 28128910 is about 5303.6694844230. The cubic root of 28128910 is about 304.1241918129.

The spelling of 28128910 in words is "twenty-eight million, one hundred twenty-eight thousand, nine hundred ten".