28993442 has 8 divisors (see below), whose sum is σ = 43564332. Its totient is φ = 14472000.

The previous prime is 28993439. The next prime is 28993453. The reversal of 28993442 is 24439982.

It can be written as a sum of positive squares in 2 ways, for example, as 28826161 + 167281 = 5369^2 + 409^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 28993442.

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, 10859 + ... + 13262.

Almost surely, 2^28993442 is an apocalyptic number.

28993442 is a deficient number, since it is larger than the sum of its proper divisors (14570890).

28993442 is a wasteful number, since it uses less digits than its factorization.

28993442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24724.

The product of its digits is 124416, while the sum is 41.

The square root of 28993442 is about 5384.5558776932. Note that the first 3 decimals coincide. The cubic root of 28993442 is about 307.2085219103.

The spelling of 28993442 in words is "twenty-eight million, nine hundred ninety-three thousand, four hundred forty-two".