28011276 has 18 divisors (see below), whose sum is σ = 70806372. Its totient is φ = 9337080.

The previous prime is 28011251. The next prime is 28011281. The reversal of 28011276 is 67211082.

It is a tau number, because it is divible by the number of its divisors (18).

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 5 ways as a sum of consecutive naturals, for example, 389010 + ... + 389081.

Almost surely, 2^28011276 is an apocalyptic number.

It is an amenable number.

28011276 is an abundant number, since it is smaller than the sum of its proper divisors (42795096).

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

28011276 is a wasteful number, since it uses less digits than its factorization.

28011276 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 778101 (or 778096 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 28011276 is about 5292.5679967290. The cubic root of 28011276 is about 303.6996543089.

The spelling of 28011276 in words is "twenty-eight million, eleven thousand, two hundred seventy-six".