28064091 has 8 divisors (see below), whose sum is σ = 40820544. Its totient is φ = 17008520.

The previous prime is 28064063. The next prime is 28064111. The reversal of 28064091 is 19046082.

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 28064091 - 2⁹ = 28063579 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28064011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 425181 + ... + 425246.

It is an arithmetic number, because the mean of its divisors is an integer number (5102568).

Almost surely, 2^28064091 is an apocalyptic number.

28064091 is a deficient number, since it is larger than the sum of its proper divisors (12756453).

28064091 is a wasteful number, since it uses less digits than its factorization.

28064091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 850441.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 28064091 is about 5297.5551908404. Note that the first 3 decimals coincide. The cubic root of 28064091 is about 303.8904087603.

Subtracting from 28064091 its reverse (19046082), we obtain a square (9018009 = 3003²).

The spelling of 28064091 in words is "twenty-eight million, sixty-four thousand, ninety-one".