28229994 has 24 divisors (see below), whose sum is σ = 65870532. Its totient is φ = 8686080.

The previous prime is 28229989. The next prime is 28230011. The reversal of 28229994 is 49992282.

It can be written as a sum of positive squares in 2 ways, for example, as 28227969 + 2025 = 5313^2 + 45^2 .

It is a super-2 number, since 2×28229994² = 1593865122480072, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 60087 + ... + 60554.

Almost surely, 2^28229994 is an apocalyptic number.

28229994 is an abundant number, since it is smaller than the sum of its proper divisors (37640538).

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

28229994 is a wasteful number, since it uses less digits than its factorization.

28229994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120662 (or 120659 counting only the distinct ones).

The product of its digits is 186624, while the sum is 45.

The square root of 28229994 is about 5313.1905668816. The cubic root of 28229994 is about 304.4880563476.

It can be divided in two parts, 282 and 29994, that added together give a square (30276 = 174²).

The spelling of 28229994 in words is "twenty-eight million, two hundred twenty-nine thousand, nine hundred ninety-four".