28073320 has 32 divisors (see below), whose sum is σ = 68908320. Its totient is φ = 10208320.

The previous prime is 28073299. The next prime is 28073369. The reversal of 28073320 is 2337082.

It is a happy number.

It is a super-2 number, since 2×28073320² = 1576222591644800, which contains 22 as substring.

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, 31462 + ... + 32341.

It is an arithmetic number, because the mean of its divisors is an integer number (2153385).

Almost surely, 2^28073320 is an apocalyptic number.

28073320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28073320 is an abundant number, since it is smaller than the sum of its proper divisors (40835000).

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

28073320 is a wasteful number, since it uses less digits than its factorization.

28073320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63825 (or 63821 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 28073320 is about 5298.4261814241. The cubic root of 28073320 is about 303.9237170094.

The spelling of 28073320 in words is "twenty-eight million, seventy-three thousand, three hundred twenty".