28717080 has 128 divisors (see below), whose sum is σ = 104302080. Its totient is φ = 6174720.

The previous prime is 28717079. The next prime is 28717081. The reversal of 28717080 is 8071782.

It is an interprime number because it is at equal distance from previous prime (28717079) and next prime (28717081).

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28717081) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13275 + ... + 15285.

It is an arithmetic number, because the mean of its divisors is an integer number (814860).

Almost surely, 2^28717080 is an apocalyptic number.

28717080 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 28717080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (52151040).

28717080 is an abundant number, since it is smaller than the sum of its proper divisors (75585000).

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

28717080 is a wasteful number, since it uses less digits than its factorization.

28717080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2049 (or 2045 counting only the distinct ones).

The product of its (nonzero) digits is 6272, while the sum is 33.

The square root of 28717080 is about 5358.8319622843. The cubic root of 28717080 is about 306.2293124996.

The spelling of 28717080 in words is "twenty-eight million, seven hundred seventeen thousand, eighty".