28293442 has 8 divisors (see below), whose sum is σ = 42468300. Its totient is φ = 14137344.

The previous prime is 28293439. The next prime is 28293443. The reversal of 28293442 is 24439282.

It can be written as a sum of positive squares in 2 ways, for example, as 28291761 + 1681 = 5319^2 + 41^2 .

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 = 28293398 and 28293407.

It is not an unprimeable number, because it can be changed into a prime (28293443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34 + ... + 7522.

Almost surely, 2^28293442 is an apocalyptic number.

28293442 is a deficient number, since it is larger than the sum of its proper divisors (14174858).

28293442 is a wasteful number, since it uses less digits than its factorization.

28293442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9380.

The product of its digits is 27648, while the sum is 34.

The square root of 28293442 is about 5319.1580160774. The cubic root of 28293442 is about 304.7160018763.

The spelling of 28293442 in words is "twenty-eight million, two hundred ninety-three thousand, four hundred forty-two".