28028651 has 8 divisors (see below), whose sum is σ = 33425664. Its totient is φ = 22979880.

The previous prime is 28028641. The next prime is 28028653. The reversal of 28028651 is 15682082.

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

It is not a de Polignac number, because 28028651 - 2¹⁴ = 28012267 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28028653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 86885 + ... + 87206.

It is an arithmetic number, because the mean of its divisors is an integer number (4178208).

Almost surely, 2^28028651 is an apocalyptic number.

28028651 is a deficient number, since it is larger than the sum of its proper divisors (5397013).

28028651 is a wasteful number, since it uses less digits than its factorization.

28028651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174121.

The product of its (nonzero) digits is 7680, while the sum is 32.

The square root of 28028651 is about 5294.2091949601. The cubic root of 28028651 is about 303.7624348695.

The spelling of 28028651 in words is "twenty-eight million, twenty-eight thousand, six hundred fifty-one".