28924138 has 8 divisors (see below), whose sum is σ = 43611588. Its totient is φ = 14386944.

The previous prime is 28924109. The next prime is 28924141. The reversal of 28924138 is 83142982.

It can be written as a sum of positive squares in 2 ways, for example, as 27910089 + 1014049 = 5283^2 + 1007^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 28924097 and 28924106.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37081 + ... + 37852.

Almost surely, 2^28924138 is an apocalyptic number.

28924138 is a deficient number, since it is larger than the sum of its proper divisors (14687450).

28924138 is a wasteful number, since it uses less digits than its factorization.

28924138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75128.

The product of its digits is 27648, while the sum is 37.

The square root of 28924138 is about 5378.1165848278. The cubic root of 28924138 is about 306.9635496624.

The spelling of 28924138 in words is "twenty-eight million, nine hundred twenty-four thousand, one hundred thirty-eight".