28069780 has 12 divisors (see below), whose sum is σ = 58946580. Its totient is φ = 11227904.

The previous prime is 28069759. The next prime is 28069801. The reversal of 28069780 is 8796082.

It is an interprime number because it is at equal distance from previous prime (28069759) and next prime (28069801).

It can be written as a sum of positive squares in 2 ways, for example, as 8832784 + 19236996 = 2972^2 + 4386^2 .

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 3 ways as a sum of consecutive naturals, for example, 701725 + ... + 701764.

It is an arithmetic number, because the mean of its divisors is an integer number (4912215).

Almost surely, 2^28069780 is an apocalyptic number.

28069780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28069780 is an abundant number, since it is smaller than the sum of its proper divisors (30876800).

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

28069780 is a wasteful number, since it uses less digits than its factorization.

28069780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1403498 (or 1403496 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 28069780 is about 5298.0921094296. The cubic root of 28069780 is about 303.9109417103.

The spelling of 28069780 in words is "twenty-eight million, sixty-nine thousand, seven hundred eighty".