28656442 has 8 divisors (see below), whose sum is σ = 43573716. Its totient is φ = 14131872.

The previous prime is 28656409. The next prime is 28656451. The reversal of 28656442 is 24465682.

It can be written as a sum of positive squares in 2 ways, for example, as 27237961 + 1418481 = 5219^2 + 1191^2 .

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

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 3 ways as a sum of consecutive naturals, for example, 97993 + ... + 98284.

Almost surely, 2^28656442 is an apocalyptic number.

28656442 is a deficient number, since it is larger than the sum of its proper divisors (14917274).

28656442 is a wasteful number, since it uses less digits than its factorization.

28656442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196352.

The product of its digits is 92160, while the sum is 37.

The square root of 28656442 is about 5353.1712096663. The cubic root of 28656442 is about 306.0136195114.

The spelling of 28656442 in words is "twenty-eight million, six hundred fifty-six thousand, four hundred forty-two".