28690660 has 48 divisors (see below), whose sum is σ = 63616896. Its totient is φ = 10847232.

The previous prime is 28690639. The next prime is 28690661. The reversal of 28690660 is 6609682.

It is not an unprimeable number, because it can be changed into a prime (28690661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44299 + ... + 44941.

It is an arithmetic number, because the mean of its divisors is an integer number (1325352).

Almost surely, 2^28690660 is an apocalyptic number.

28690660 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 28690660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31808448).

28690660 is an abundant number, since it is smaller than the sum of its proper divisors (34926236).

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

28690660 is a wasteful number, since it uses less digits than its factorization.

28690660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 772 (or 770 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 28690660 is about 5356.3663056218. The cubic root of 28690660 is about 306.1353723445.

The spelling of 28690660 in words is "twenty-eight million, six hundred ninety thousand, six hundred sixty".