28495139 has 8 divisors (see below), whose sum is σ = 29694000. Its totient is φ = 27310752.

The previous prime is 28495121. The next prime is 28495147. The reversal of 28495139 is 93159482.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28495139 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28495096 and 28495105.

It is not an unprimeable number, because it can be changed into a prime (28495109) 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, 497 + ... + 7565.

It is an arithmetic number, because the mean of its divisors is an integer number (3711750).

Almost surely, 2^28495139 is an apocalyptic number.

28495139 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

28495139 is a deficient number, since it is larger than the sum of its proper divisors (1198861).

28495139 is a wasteful number, since it uses less digits than its factorization.

28495139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7237.

The product of its digits is 77760, while the sum is 41.

The square root of 28495139 is about 5338.0838322379. The cubic root of 28495139 is about 305.4383699073.

The spelling of 28495139 in words is "twenty-eight million, four hundred ninety-five thousand, one hundred thirty-nine".