28669140 has 144 divisors (see below), whose sum is σ = 95764032. Its totient is φ = 7174656.

The previous prime is 28669111. The next prime is 28669169. The reversal of 28669140 is 4196682.

It is an interprime number because it is at equal distance from previous prime (28669111) and next prime (28669169).

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

It is a junction number, because it is equal to n+sod(n) for n = 28669095 and 28669104.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 82447 + ... + 82793.

It is an arithmetic number, because the mean of its divisors is an integer number (665028).

Almost surely, 2^28669140 is an apocalyptic number.

28669140 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 28669140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47882016).

28669140 is an abundant number, since it is smaller than the sum of its proper divisors (67094892).

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

28669140 is a wasteful number, since it uses less digits than its factorization.

28669140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388 (or 374 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 28669140 is about 5354.3571042656. The cubic root of 28669140 is about 306.0588122252.

The spelling of 28669140 in words is "twenty-eight million, six hundred sixty-nine thousand, one hundred forty".