28514139 has 4 divisors (see below), whose sum is σ = 38018856. Its totient is φ = 19009424.

The previous prime is 28514137. The next prime is 28514149. The reversal of 28514139 is 93141582.

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

It is a cyclic number.

It is not a de Polignac number, because 28514139 - 2¹ = 28514137 is a prime.

It is a super-2 number, since 2×28514139² = 1626112245822642, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28514131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4752354 + ... + 4752359.

It is an arithmetic number, because the mean of its divisors is an integer number (9504714).

Almost surely, 2^28514139 is an apocalyptic number.

28514139 is a deficient number, since it is larger than the sum of its proper divisors (9504717).

28514139 is an equidigital number, since it uses as much as digits as its factorization.

28514139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9504716.

The product of its digits is 8640, while the sum is 33.

The square root of 28514139 is about 5339.8632004949. The cubic root of 28514139 is about 305.5062415965.

The spelling of 28514139 in words is "twenty-eight million, five hundred fourteen thousand, one hundred thirty-nine".