28603988 has 12 divisors (see below), whose sum is σ = 57208032. Its totient is φ = 12258840.

The previous prime is 28603963. The next prime is 28603999. The reversal of 28603988 is 88930682.

28603988 is an admirable number.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 510758 + ... + 510813.

It is an arithmetic number, because the mean of its divisors is an integer number (4767336).

Almost surely, 2^28603988 is an apocalyptic number.

28603988 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

28603988 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28603988 is a wasteful number, since it uses less digits than its factorization.

28603988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1021582 (or 1021580 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 44.

The square root of 28603988 is about 5348.2696267111. The cubic root of 28603988 is about 305.8267919185.

The spelling of 28603988 in words is "twenty-eight million, six hundred three thousand, nine hundred eighty-eight".