28928672 has 48 divisors (see below), whose sum is σ = 59725512. Its totient is φ = 13777920.

The previous prime is 28928651. The next prime is 28928677. The reversal of 28928672 is 27682982.

It can be written as a sum of positive squares in 4 ways, for example, as 28344976 + 583696 = 5324^2 + 764^2 .

It is not an unprimeable number, because it can be changed into a prime (28928677) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62522 + ... + 62982.

Almost surely, 2^28928672 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 28928672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29862756).

28928672 is an abundant number, since it is smaller than the sum of its proper divisors (30796840).

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

28928672 is a wasteful number, since it uses less digits than its factorization.

28928672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 561 (or 553 counting only the distinct ones).

The product of its digits is 193536, while the sum is 44.

The square root of 28928672 is about 5378.5380913404. The cubic root of 28928672 is about 306.9795881699.

The spelling of 28928672 in words is "twenty-eight million, nine hundred twenty-eight thousand, six hundred seventy-two".