28686680 has 48 divisors (see below), whose sum is σ = 70958160. Its totient is φ = 10429760.

The previous prime is 28686677. The next prime is 28686689. The reversal of 28686680 is 8668682.

28686680 = T₃₆₄ + T₃₆₅ + ... + T₆₀₃.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28686689) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1877 + ... + 7803.

It is an arithmetic number, because the mean of its divisors is an integer number (1478295).

Almost surely, 2^28686680 is an apocalyptic number.

28686680 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 28686680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35479080).

28686680 is an abundant number, since it is smaller than the sum of its proper divisors (42271480).

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

28686680 is a wasteful number, since it uses less digits than its factorization.

28686680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5960 (or 5945 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 44.

The square root of 28686680 is about 5355.9947722155. The cubic root of 28686680 is about 306.1212158777.

The spelling of 28686680 in words is "twenty-eight million, six hundred eighty-six thousand, six hundred eighty".