28693504 has 44 divisors (see below), whose sum is σ = 65569504. Its totient is φ = 12294144.

The previous prime is 28693493. The next prime is 28693517. The reversal of 28693504 is 40539682.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5167 + ... + 9169.

It is an arithmetic number, because the mean of its divisors is an integer number (1490216).

Almost surely, 2^28693504 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 28693504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32784752).

28693504 is an abundant number, since it is smaller than the sum of its proper divisors (36876000).

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

28693504 is an equidigital number, since it uses as much as digits as its factorization.

28693504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4030 (or 4012 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 28693504 is about 5356.6317775259. The cubic root of 28693504 is about 306.1454873695.

The spelling of 28693504 in words is "twenty-eight million, six hundred ninety-three thousand, five hundred four".