28569380 has 24 divisors (see below), whose sum is σ = 68566848. Its totient is φ = 9795168.

The previous prime is 28569377. The next prime is 28569389. The reversal of 28569380 is 8396582.

It is not an unprimeable number, because it can be changed into a prime (28569389) 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, 101894 + ... + 102173.

It is an arithmetic number, because the mean of its divisors is an integer number (2856952).

Almost surely, 2^28569380 is an apocalyptic number.

28569380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28569380 is an abundant number, since it is smaller than the sum of its proper divisors (39997468).

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

28569380 is a wasteful number, since it uses less digits than its factorization.

28569380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204083 (or 204081 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 41.

The square root of 28569380 is about 5345.0332085030. The cubic root of 28569380 is about 305.7034020723.

The spelling of 28569380 in words is "twenty-eight million, five hundred sixty-nine thousand, three hundred eighty".