28000075 has 12 divisors (see below), whose sum is σ = 34919640. Its totient is φ = 22271360.

The previous prime is 28000073. The next prime is 28000087. The reversal of 28000075 is 57000082.

It is not a de Polignac number, because 28000075 - 2¹ = 28000073 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28000073) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1347 + ... + 7603.

It is an arithmetic number, because the mean of its divisors is an integer number (2909970).

Almost surely, 2^28000075 is an apocalyptic number.

28000075 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28000075 is a deficient number, since it is larger than the sum of its proper divisors (6919565).

28000075 is a wasteful number, since it uses less digits than its factorization.

28000075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6446 (or 6441 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 22.

The square root of 28000075 is about 5291.5097089583. The cubic root of 28000075 is about 303.6591683113.

The spelling of 28000075 in words is "twenty-eight million, seventy-five", and thus it is an aban number and an uban number.