28292091 has 8 divisors (see below), whose sum is σ = 38643024. Its totient is φ = 18401280.

The previous prime is 28292071. The next prime is 28292101. The reversal of 28292091 is 19029282.

It is a happy number.

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

It is not a de Polignac number, because 28292091 - 2⁹ = 28291579 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28292071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 114886 + ... + 115131.

It is an arithmetic number, because the mean of its divisors is an integer number (4830378).

Almost surely, 2^28292091 is an apocalyptic number.

28292091 is a deficient number, since it is larger than the sum of its proper divisors (10350933).

28292091 is a wasteful number, since it uses less digits than its factorization.

28292091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230061.

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 28292091 is about 5319.0310207781. The cubic root of 28292091 is about 304.7111517787.

The spelling of 28292091 in words is "twenty-eight million, two hundred ninety-two thousand, ninety-one".