28069280 has 24 divisors (see below), whose sum is σ = 66314052. Its totient is φ = 11227648.

The previous prime is 28069267. The next prime is 28069331. The reversal of 28069280 is 8296082.

It can be written as a sum of positive squares in 2 ways, for example, as 26337424 + 1731856 = 5132^2 + 1316^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 28069280.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87557 + ... + 87876.

Almost surely, 2^28069280 is an apocalyptic number.

28069280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28069280 is an abundant number, since it is smaller than the sum of its proper divisors (38244772).

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

28069280 is a wasteful number, since it uses less digits than its factorization.

28069280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175448 (or 175440 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 28069280 is about 5298.0449224219. The cubic root of 28069280 is about 303.9091372029.

The spelling of 28069280 in words is "twenty-eight million, sixty-nine thousand, two hundred eighty".