28067920 has 40 divisors (see below), whose sum is σ = 65948904. Its totient is φ = 11108352.

The previous prime is 28067891. The next prime is 28067939. The reversal of 28067920 is 2976082.

It can be written as a sum of positive squares in 4 ways, for example, as 104976 + 27962944 = 324^2 + 5288^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5952 + ... + 9568.

Almost surely, 2^28067920 is an apocalyptic number.

28067920 is a gapful number since it is divisible by the number (20) 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 28067920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32974452).

28067920 is an abundant number, since it is smaller than the sum of its proper divisors (37880984).

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

28067920 is a wasteful number, since it uses less digits than its factorization.

28067920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3727 (or 3721 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 28067920 is about 5297.9165716346. The cubic root of 28067920 is about 303.9042288345.

The spelling of 28067920 in words is "twenty-eight million, sixty-seven thousand, nine hundred twenty".