28729080 has 80 divisors (see below), whose sum is σ = 96572520. Its totient is φ = 7660224.

The previous prime is 28729073. The next prime is 28729081. The reversal of 28729080 is 8092782.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28729081) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1194 + ... + 7673.

Almost surely, 2^28729080 is an apocalyptic number.

28729080 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 28729080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48286260).

28729080 is an abundant number, since it is smaller than the sum of its proper divisors (67843440).

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

28729080 is a wasteful number, since it uses less digits than its factorization.

28729080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8890 (or 8877 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 28729080 is about 5359.9514923178. The cubic root of 28729080 is about 306.2719612184.

The spelling of 28729080 in words is "twenty-eight million, seven hundred twenty-nine thousand, eighty".