28920768 has 112 divisors (see below), whose sum is σ = 81540096. Its totient is φ = 9031680.

The previous prime is 28920767. The next prime is 28920779. The reversal of 28920768 is 86702982.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28920761) 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, 255880 + ... + 255992.

Almost surely, 2^28920768 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28920768, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40770048).

28920768 is an abundant number, since it is smaller than the sum of its proper divisors (52619328).

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

28920768 is a wasteful number, since it uses less digits than its factorization.

28920768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202 (or 192 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 42.

The square root of 28920768 is about 5377.8032689938. The cubic root of 28920768 is about 306.9516275861.

The spelling of 28920768 in words is "twenty-eight million, nine hundred twenty thousand, seven hundred sixty-eight".