28491794 has 4 divisors (see below), whose sum is σ = 42737694. Its totient is φ = 14245896.

The previous prime is 28491781. The next prime is 28491829. The reversal of 28491794 is 49719482.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 49719482 = 2 ⋅24859741.

It can be written as a sum of positive squares in only one way, i.e., 20295025 + 8196769 = 4505^2 + 2863^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7122947 + ... + 7122950.

Almost surely, 2^28491794 is an apocalyptic number.

28491794 is a deficient number, since it is larger than the sum of its proper divisors (14245900).

28491794 is a wasteful number, since it uses less digits than its factorization.

28491794 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14245899.

The product of its digits is 145152, while the sum is 44.

The square root of 28491794 is about 5337.7705083677. The cubic root of 28491794 is about 305.4264177947.

The spelling of 28491794 in words is "twenty-eight million, four hundred ninety-one thousand, seven hundred ninety-four".