28070755 has 4 divisors (see below), whose sum is σ = 33684912. Its totient is φ = 22456600.

The previous prime is 28070737. The next prime is 28070759. The reversal of 28070755 is 55707082.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 28070755 - 2¹¹ = 28068707 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28070755.

It is not an unprimeable number, because it can be changed into a prime (28070759) by changing a digit.

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, 2807071 + ... + 2807080.

It is an arithmetic number, because the mean of its divisors is an integer number (8421228).

Almost surely, 2^28070755 is an apocalyptic number.

28070755 is a deficient number, since it is larger than the sum of its proper divisors (5614157).

28070755 is an equidigital number, since it uses as much as digits as its factorization.

28070755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5614156.

The product of its (nonzero) digits is 19600, while the sum is 34.

The square root of 28070755 is about 5298.1841228859. The cubic root of 28070755 is about 303.9144604380.

The spelling of 28070755 in words is "twenty-eight million, seventy thousand, seven hundred fifty-five".