28028746 has 8 divisors (see below), whose sum is σ = 42415524. Its totient is φ = 13890240.

The previous prime is 28028731. The next prime is 28028747. The reversal of 28028746 is 64782082.

It can be written as a sum of positive squares in 2 ways, for example, as 27973521 + 55225 = 5289^2 + 235^2 .

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

It is a super-2 number, since 2×28028746² = 1571221204665032, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28028747) 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, 61785 + ... + 62236.

Almost surely, 2^28028746 is an apocalyptic number.

28028746 is a deficient number, since it is larger than the sum of its proper divisors (14386778).

28028746 is a wasteful number, since it uses less digits than its factorization.

28028746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124136.

The product of its (nonzero) digits is 43008, while the sum is 37.

The square root of 28028746 is about 5294.2181670196. The cubic root of 28028746 is about 303.7627780588.

The spelling of 28028746 in words is "twenty-eight million, twenty-eight thousand, seven hundred forty-six".