28861680 has 80 divisors (see below), whose sum is σ = 91199520. Its totient is φ = 7547904.

The previous prime is 28861667. The next prime is 28861697. The reversal of 28861680 is 8616882.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11586 + ... + 13854.

It is an arithmetic number, because the mean of its divisors is an integer number (1139994).

Almost surely, 2^28861680 is an apocalyptic number.

28861680 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 28861680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45599760).

28861680 is an abundant number, since it is smaller than the sum of its proper divisors (62337840).

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

28861680 is a wasteful number, since it uses less digits than its factorization.

28861680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2338 (or 2332 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 39.

The square root of 28861680 is about 5372.3067671160. The cubic root of 28861680 is about 306.7424408428.

The spelling of 28861680 in words is "twenty-eight million, eight hundred sixty-one thousand, six hundred eighty".