28139574 has 16 divisors (see below), whose sum is σ = 56389680. Its totient is φ = 9361440.

The previous prime is 28139569. The next prime is 28139597. The reversal of 28139574 is 47593182.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1089 + ... + 7580.

It is an arithmetic number, because the mean of its divisors is an integer number (3524355).

Almost surely, 2^28139574 is an apocalyptic number.

28139574 is an abundant number, since it is smaller than the sum of its proper divisors (28250106).

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

28139574 is a wasteful number, since it uses less digits than its factorization.

28139574 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9215.

The product of its digits is 60480, while the sum is 39.

The square root of 28139574 is about 5304.6747308388. The cubic root of 28139574 is about 304.1626193077.

The spelling of 28139574 in words is "twenty-eight million, one hundred thirty-nine thousand, five hundred seventy-four".