28693130 has 16 divisors (see below), whose sum is σ = 53044200. Its totient is φ = 11166912.

The previous prime is 28693123. The next prime is 28693139. The reversal of 28693130 is 3139682.

It can be written as a sum of positive squares in 4 ways, for example, as 23435281 + 5257849 = 4841^2 + 2293^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28693139) 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 7 ways as a sum of consecutive naturals, for example, 38405 + ... + 39144.

Almost surely, 2^28693130 is an apocalyptic number.

28693130 is a deficient number, since it is larger than the sum of its proper divisors (24351070).

28693130 is a wasteful number, since it uses less digits than its factorization.

28693130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77593.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 28693130 is about 5356.5968674150. The cubic root of 28693130 is about 306.1441572321.

The spelling of 28693130 in words is "twenty-eight million, six hundred ninety-three thousand, one hundred thirty".