28427139 has 16 divisors (see below), whose sum is σ = 45354400. Its totient is φ = 17493408.

The previous prime is 28427129. The next prime is 28427167. The reversal of 28427139 is 93172482.

It is not a de Polignac number, because 28427139 - 2⁵ = 28427107 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28427129) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40144 + ... + 40845.

It is an arithmetic number, because the mean of its divisors is an integer number (2834650).

Almost surely, 2^28427139 is an apocalyptic number.

28427139 is a deficient number, since it is larger than the sum of its proper divisors (16927261).

28427139 is a wasteful number, since it uses less digits than its factorization.

28427139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81011 (or 81005 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 28427139 is about 5331.7107010790. The cubic root of 28427139 is about 305.1952131992.

The spelling of 28427139 in words is "twenty-eight million, four hundred twenty-seven thousand, one hundred thirty-nine".