28137123 has 18 divisors (see below), whose sum is σ = 47278764. Its totient is φ = 16078104.

The previous prime is 28137121. The next prime is 28137143. The reversal of 28137123 is 32173182.

It is not a de Polignac number, because 28137123 - 2¹ = 28137121 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28137121) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 31461 + ... + 32342.

It is an arithmetic number, because the mean of its divisors is an integer number (2626598).

Almost surely, 2^28137123 is an apocalyptic number.

28137123 is a deficient number, since it is larger than the sum of its proper divisors (19141641).

28137123 is a wasteful number, since it uses less digits than its factorization.

28137123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63823 (or 63813 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 28137123 is about 5304.4437031606. The cubic root of 28137123 is about 304.1537880413.

The spelling of 28137123 in words is "twenty-eight million, one hundred thirty-seven thousand, one hundred twenty-three".