28135970 has 16 divisors (see below), whose sum is σ = 50970168. Its totient is φ = 11182080.

The previous prime is 28135957. The next prime is 28135973. The reversal of 28135970 is 7953182.

It can be written as a sum of positive squares in 4 ways, for example, as 10738729 + 17397241 = 3277^2 + 4171^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 28135970.

It is not an unprimeable number, because it can be changed into a prime (28135973) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 7391 + ... + 10530.

Almost surely, 2^28135970 is an apocalyptic number.

28135970 is a deficient number, since it is larger than the sum of its proper divisors (22834198).

28135970 is a wasteful number, since it uses less digits than its factorization.

28135970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18085.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 28135970 is about 5304.3350195854. The cubic root of 28135970 is about 304.1496334575.

The spelling of 28135970 in words is "twenty-eight million, one hundred thirty-five thousand, nine hundred seventy".