28689300 has 108 divisors (see below), whose sum is σ = 90994176. Its totient is φ = 7560000.

The previous prime is 28689289. The next prime is 28689329. The reversal of 28689300 is 398682.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 114175 + ... + 114425.

Almost surely, 2^28689300 is an apocalyptic number.

28689300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28689300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45497088).

28689300 is an abundant number, since it is smaller than the sum of its proper divisors (62304876).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28689300 is a wasteful number, since it uses less digits than its factorization.

28689300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398 (or 388 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 28689300 is about 5356.2393523815. The cubic root of 28689300 is about 306.1305351061.

The spelling of 28689300 in words is "twenty-eight million, six hundred eighty-nine thousand, three hundred".