28771680 has 96 divisors (see below), whose sum is σ = 103590144. Its totient is φ = 6575616.

The previous prime is 28771679. The next prime is 28771697. The reversal of 28771680 is 8617782.

It is a tau number, because it is divible by the number of its divisors (96).

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 922 + ... + 7641.

It is an arithmetic number, because the mean of its divisors is an integer number (1079064).

Almost surely, 2^28771680 is an apocalyptic number.

28771680 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 28771680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51795072).

28771680 is an abundant number, since it is smaller than the sum of its proper divisors (74818464).

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

28771680 is a wasteful number, since it uses less digits than its factorization.

28771680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8588 (or 8580 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 39.

The square root of 28771680 is about 5363.9239368209. The cubic root of 28771680 is about 306.4232683259.

The spelling of 28771680 in words is "twenty-eight million, seven hundred seventy-one thousand, six hundred eighty".