28443700 has 36 divisors (see below), whose sum is σ = 61956972. Its totient is φ = 11334400.

The previous prime is 28443697. The next prime is 28443731. The reversal of 28443700 is 734482.

It can be written as a sum of positive squares in 6 ways, for example, as 7540516 + 20903184 = 2746^2 + 4572^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 45792 + ... + 46408.

It is an arithmetic number, because the mean of its divisors is an integer number (1721027).

Almost surely, 2^28443700 is an apocalyptic number.

28443700 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28443700 is an abundant number, since it is smaller than the sum of its proper divisors (33513272).

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

28443700 is a wasteful number, since it uses less digits than its factorization.

28443700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1092 (or 1085 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 28.

The square root of 28443700 is about 5333.2635412100. The cubic root of 28443700 is about 305.2544682738.

The spelling of 28443700 in words is "twenty-eight million, four hundred forty-three thousand, seven hundred".