28639080 has 192 divisors, whose sum is σ = 101088000. Its totient is φ = 7008768.

The previous prime is 28639063. The next prime is 28639097. The reversal of 28639080 is 8093682.

It is an interprime number because it is at equal distance from previous prime (28639063) and next prime (28639097).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 362481 + ... + 362559.

It is an arithmetic number, because the mean of its divisors is an integer number (526500).

Almost surely, 2^28639080 is an apocalyptic number.

28639080 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 28639080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50544000).

28639080 is an abundant number, since it is smaller than the sum of its proper divisors (72448920).

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

28639080 is a wasteful number, since it uses less digits than its factorization.

28639080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168 (or 161 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 28639080 is about 5351.5493083779. The cubic root of 28639080 is about 305.9518058150.

The spelling of 28639080 in words is "twenty-eight million, six hundred thirty-nine thousand, eighty".