28728910 has 16 divisors (see below), whose sum is σ = 59099616. Its totient is φ = 9849888.

The previous prime is 28728881. The next prime is 28728911. The reversal of 28728910 is 1982782.

It is a self number, because there is not a number n which added to its sum of digits gives 28728910.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28728911) 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, 205137 + ... + 205276.

It is an arithmetic number, because the mean of its divisors is an integer number (3693726).

Almost surely, 2^28728910 is an apocalyptic number.

28728910 is an abundant number, since it is smaller than the sum of its proper divisors (30370706).

28728910 is a wasteful number, since it uses less digits than its factorization.

28728910 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410427.

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 28728910 is about 5359.9356339419. The cubic root of 28728910 is about 306.2713571112.

The spelling of 28728910 in words is "twenty-eight million, seven hundred twenty-eight thousand, nine hundred ten".