28931360 has 48 divisors (see below), whose sum is σ = 69314616. Its totient is φ = 11409408.

The previous prime is 28931347. The next prime is 28931369. The reversal of 28931360 is 6313982.

It can be written as a sum of positive squares in 4 ways, for example, as 23931664 + 4999696 = 4892^2 + 2236^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

It is not an unprimeable number, because it can be changed into a prime (28931369) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10442 + ... + 12918.

Almost surely, 2^28931360 is an apocalyptic number.

28931360 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 28931360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34657308).

28931360 is an abundant number, since it is smaller than the sum of its proper divisors (40383256).

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

28931360 is a wasteful number, since it uses less digits than its factorization.

28931360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2565 (or 2557 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 28931360 is about 5378.7879675630. The cubic root of 28931360 is about 306.9890958719.

The spelling of 28931360 in words is "twenty-eight million, nine hundred thirty-one thousand, three hundred sixty".