28043780 has 24 divisors (see below), whose sum is σ = 60485208. Its totient is φ = 10914048.

The previous prime is 28043779. The next prime is 28043789. The reversal of 28043780 is 8734082.

It can be written as a sum of positive squares in 4 ways, for example, as 1149184 + 26894596 = 1072^2 + 5186^2 .

It is not an unprimeable number, because it can be changed into a prime (28043789) 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, 18209 + ... + 19688.

It is an arithmetic number, because the mean of its divisors is an integer number (2520217).

Almost surely, 2^28043780 is an apocalyptic number.

28043780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28043780 is an abundant number, since it is smaller than the sum of its proper divisors (32441428).

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

28043780 is a wasteful number, since it uses less digits than its factorization.

28043780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37943 (or 37941 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 32.

The square root of 28043780 is about 5295.6378274954. The cubic root of 28043780 is about 303.8170788986.

The spelling of 28043780 in words is "twenty-eight million, forty-three thousand, seven hundred eighty".