28639104 has 64 divisors (see below), whose sum is σ = 81938640. Its totient is φ = 8810496.

The previous prime is 28639103. The next prime is 28639111. The reversal of 28639104 is 40193682.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28639103) 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, 2124 + ... + 7860.

Almost surely, 2^28639104 is an apocalyptic number.

28639104 is a gapful number since it is divisible by the number (24) 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 28639104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40969320).

28639104 is an abundant number, since it is smaller than the sum of its proper divisors (53299536).

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

28639104 is a wasteful number, since it uses less digits than its factorization.

28639104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5767 (or 5755 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 28639104 is about 5351.5515507187. The cubic root of 28639104 is about 305.9518912792.

The spelling of 28639104 in words is "twenty-eight million, six hundred thirty-nine thousand, one hundred four".