28603978 has 16 divisors (see below), whose sum is σ = 47335176. Its totient is φ = 12879360.

The previous prime is 28603963. The next prime is 28603999. The reversal of 28603978 is 87930682.

It can be written as a sum of positive squares in 4 ways, for example, as 5631129 + 22972849 = 2373^2 + 4793^2 .

It is an unprimeable number.

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, 12351 + ... + 14482.

Almost surely, 2^28603978 is an apocalyptic number.

28603978 is a deficient number, since it is larger than the sum of its proper divisors (18731198).

28603978 is a wasteful number, since it uses less digits than its factorization.

28603978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26889.

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 28603978 is about 5348.2686918292. The cubic root of 28603978 is about 305.8267562793.

The spelling of 28603978 in words is "twenty-eight million, six hundred three thousand, nine hundred seventy-eight".