28446491 has 8 divisors (see below), whose sum is σ = 30227904. Its totient is φ = 26677120.

The previous prime is 28446487. The next prime is 28446527. The reversal of 28446491 is 19464482.

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 28446491 - 2² = 28446487 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28446461) 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, 2126 + ... + 7836.

It is an arithmetic number, because the mean of its divisors is an integer number (3778488).

Almost surely, 2^28446491 is an apocalyptic number.

28446491 is a deficient number, since it is larger than the sum of its proper divisors (1781413).

28446491 is a wasteful number, since it uses less digits than its factorization.

28446491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6021.

The product of its digits is 55296, while the sum is 38.

The square root of 28446491 is about 5333.5251944657. The cubic root of 28446491 is about 305.2644521760.

Subtracting from 28446491 its reverse (19464482), we obtain a square (8982009 = 2997²).

The spelling of 28446491 in words is "twenty-eight million, four hundred forty-six thousand, four hundred ninety-one".