28993272 has 128 divisors (see below), whose sum is σ = 93657600. Its totient is φ = 7257600.

The previous prime is 28993267. The next prime is 28993291. The reversal of 28993272 is 27239982.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 53322 + ... + 53862.

It is an arithmetic number, because the mean of its divisors is an integer number (731700).

Almost surely, 2^28993272 is an apocalyptic number.

28993272 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28993272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46828800).

28993272 is an abundant number, since it is smaller than the sum of its proper divisors (64664328).

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

28993272 is a wasteful number, since it uses less digits than its factorization.

28993272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 597 (or 593 counting only the distinct ones).

The product of its digits is 108864, while the sum is 42.

The square root of 28993272 is about 5384.5400917813. The cubic root of 28993272 is about 307.2079214808.

The spelling of 28993272 in words is "twenty-eight million, nine hundred ninety-three thousand, two hundred seventy-two".