28355139 has 6 divisors (see below), whose sum is σ = 40957436. Its totient is φ = 18903420.

The previous prime is 28355123. The next prime is 28355143. The reversal of 28355139 is 93155382.

It is not a de Polignac number, because 28355139 - 2⁴ = 28355123 is a prime.

It is a super-3 number, since 3×28355139³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28355039) 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 5 ways as a sum of consecutive naturals, for example, 1575277 + ... + 1575294.

Almost surely, 2^28355139 is an apocalyptic number.

28355139 is a deficient number, since it is larger than the sum of its proper divisors (12602297).

28355139 is a wasteful number, since it uses less digits than its factorization.

28355139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3150577 (or 3150574 counting only the distinct ones).

The product of its digits is 32400, while the sum is 36.

The square root of 28355139 is about 5324.9543660016. The cubic root of 28355139 is about 304.9373301319.

The spelling of 28355139 in words is "twenty-eight million, three hundred fifty-five thousand, one hundred thirty-nine".