28981603 has 8 divisors (see below), whose sum is σ = 33199200. Its totient is φ = 24783360.

The previous prime is 28981597. The next prime is 28981607. The reversal of 28981603 is 30618982.

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

It is not a de Polignac number, because 28981603 - 2⁵ = 28981571 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28981607) 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, 1468 + ... + 7753.

It is an arithmetic number, because the mean of its divisors is an integer number (4149900).

Almost surely, 2^28981603 is an apocalyptic number.

28981603 is a deficient number, since it is larger than the sum of its proper divisors (4217597).

28981603 is an equidigital number, since it uses as much as digits as its factorization.

28981603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9677.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 28981603 is about 5383.4564175816. The cubic root of 28981603 is about 307.1667016848.

It can be divided in two parts, 28981 and 603, that added together give a square (29584 = 172²).

The spelling of 28981603 in words is "twenty-eight million, nine hundred eighty-one thousand, six hundred three".