28138914 has 24 divisors (see below), whose sum is σ = 63226800. Its totient is φ = 9379476.

The previous prime is 28138897. The next prime is 28138937. The reversal of 28138914 is 41983182.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28464 + ... + 29435.

It is an arithmetic number, because the mean of its divisors is an integer number (2634450).

Almost surely, 2^28138914 is an apocalyptic number.

28138914 is an abundant number, since it is smaller than the sum of its proper divisors (35087886).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28138914 is an equidigital number, since it uses as much as digits as its factorization.

28138914 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57916 (or 57904 counting only the distinct ones).

The product of its digits is 13824, while the sum is 36.

The square root of 28138914 is about 5304.6125211932. The cubic root of 28138914 is about 304.1602412938.

The spelling of 28138914 in words is "twenty-eight million, one hundred thirty-eight thousand, nine hundred fourteen".