28091098 has 8 divisors (see below), whose sum is σ = 48156192. Its totient is φ = 12039036.

The previous prime is 28091093. The next prime is 28091117. The reversal of 28091098 is 89019082.

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

It is not an unprimeable number, because it can be changed into a prime (28091093) 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 3 ways as a sum of consecutive naturals, for example, 1003240 + ... + 1003267.

It is an arithmetic number, because the mean of its divisors is an integer number (6019524).

Almost surely, 2^28091098 is an apocalyptic number.

28091098 is a deficient number, since it is larger than the sum of its proper divisors (20065094).

28091098 is a wasteful number, since it uses less digits than its factorization.

28091098 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2006516.

The product of its (nonzero) digits is 10368, while the sum is 37.

The square root of 28091098 is about 5300.1035838934. The cubic root of 28091098 is about 303.9878587603.

It can be divided in two parts, 280 and 91098, that added together give a triangular number (91378 = T₄₂₇).

The spelling of 28091098 in words is "twenty-eight million, ninety-one thousand, ninety-eight".