28091701 has 8 divisors (see below), whose sum is σ = 32448384. Its totient is φ = 24035520.

The previous prime is 28091677. The next prime is 28091711. The reversal of 28091701 is 10719082.

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

It is a cyclic number.

It is not a de Polignac number, because 28091701 - 2⁷ = 28091573 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28091701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28091711) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 74925 + ... + 75298.

It is an arithmetic number, because the mean of its divisors is an integer number (4056048).

Almost surely, 2^28091701 is an apocalyptic number.

It is an amenable number.

28091701 is a deficient number, since it is larger than the sum of its proper divisors (4356683).

28091701 is a wasteful number, since it uses less digits than its factorization.

28091701 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150251.

The product of its (nonzero) digits is 1008, while the sum is 28.

The square root of 28091701 is about 5300.1604692688. The cubic root of 28091701 is about 303.9900338665.

The spelling of 28091701 in words is "twenty-eight million, ninety-one thousand, seven hundred one".