28940660 has 72 divisors (see below), whose sum is σ = 71858304. Its totient is φ = 9590400.

The previous prime is 28940627. The next prime is 28940663. The reversal of 28940660 is 6604982.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 28940660.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28940663) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 191585 + ... + 191735.

It is an arithmetic number, because the mean of its divisors is an integer number (998032).

Almost surely, 2^28940660 is an apocalyptic number.

28940660 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 28940660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35929152).

28940660 is an abundant number, since it is smaller than the sum of its proper divisors (42917644).

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

28940660 is a wasteful number, since it uses less digits than its factorization.

28940660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241 (or 202 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 28940660 is about 5379.6524051280. The cubic root of 28940660 is about 307.0219862802.

The spelling of 28940660 in words is "twenty-eight million, nine hundred forty thousand, six hundred sixty".