28870660 has 96 divisors (see below), whose sum is σ = 77333760. Its totient is φ = 8805888.

The previous prime is 28870649. The next prime is 28870661. The reversal of 28870660 is 6607882.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28870661) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 52507 + ... + 53053.

It is an arithmetic number, because the mean of its divisors is an integer number (805560).

Almost surely, 2^28870660 is an apocalyptic number.

28870660 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 28870660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38666880).

28870660 is an abundant number, since it is smaller than the sum of its proper divisors (48463100).

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

28870660 is a wasteful number, since it uses less digits than its factorization.

28870660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 605 (or 603 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 37.

The square root of 28870660 is about 5373.1424697285. The cubic root of 28870660 is about 306.7742507430.

The spelling of 28870660 in words is "twenty-eight million, eight hundred seventy thousand, six hundred sixty".