28532277 has 16 divisors (see below), whose sum is σ = 42367680. Its totient is φ = 18977616.

The previous prime is 28532267. The next prime is 28532293. The reversal of 28532277 is 77223582.

It is a happy number.

It is not a de Polignac number, because 28532277 - 2⁴ = 28532261 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28532227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14263 + ... + 16139.

It is an arithmetic number, because the mean of its divisors is an integer number (2647980).

Almost surely, 2^28532277 is an apocalyptic number.

28532277 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

28532277 is a deficient number, since it is larger than the sum of its proper divisors (13835403).

28532277 is a wasteful number, since it uses less digits than its factorization.

28532277 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2449 (or 2443 counting only the distinct ones).

The product of its digits is 47040, while the sum is 36.

The square root of 28532277 is about 5341.5612886122. The cubic root of 28532277 is about 305.5710059307.

The spelling of 28532277 in words is "twenty-eight million, five hundred thirty-two thousand, two hundred seventy-seven".