28972280 has 32 divisors (see below), whose sum is σ = 65361600. Its totient is φ = 11558016.

The previous prime is 28972271. The next prime is 28972319. The reversal of 28972280 is 8227982.

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 7 ways as a sum of consecutive naturals, for example, 19649 + ... + 21071.

It is an arithmetic number, because the mean of its divisors is an integer number (2042550).

Almost surely, 2^28972280 is an apocalyptic number.

28972280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28972280 is an abundant number, since it is smaller than the sum of its proper divisors (36389320).

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

28972280 is a wasteful number, since it uses less digits than its factorization.

28972280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1943 (or 1939 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 28972280 is about 5382.5904544188. The cubic root of 28972280 is about 307.1337609915.

The spelling of 28972280 in words is "twenty-eight million, nine hundred seventy-two thousand, two hundred eighty".