28878580 has 48 divisors (see below), whose sum is σ = 64740816. Its totient is φ = 10782720.

The previous prime is 28878571. The next prime is 28878601. The reversal of 28878580 is 8587882.

It can be written as a sum of positive squares in 8 ways, for example, as 191844 + 28686736 = 438^2 + 5356^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 28878580.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53110 + ... + 53650.

It is an arithmetic number, because the mean of its divisors is an integer number (1348767).

Almost surely, 2^28878580 is an apocalyptic number.

28878580 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 28878580, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32370408).

28878580 is an abundant number, since it is smaller than the sum of its proper divisors (35862236).

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

28878580 is a wasteful number, since it uses less digits than its factorization.

28878580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 724 (or 722 counting only the distinct ones).

The product of its (nonzero) digits is 286720, while the sum is 46.

The square root of 28878580 is about 5373.8794180741. The cubic root of 28878580 is about 306.8023003261.

The spelling of 28878580 in words is "twenty-eight million, eight hundred seventy-eight thousand, five hundred eighty".