28728315 has 48 divisors (see below), whose sum is σ = 62090496. Its totient is φ = 11937600.

The previous prime is 28728307. The next prime is 28728319. The reversal of 28728315 is 51382782.

It is not a de Polignac number, because 28728315 - 2³ = 28728307 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28728315.

It is not an unprimeable number, because it can be changed into a prime (28728319) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 681 + ... + 7610.

It is an arithmetic number, because the mean of its divisors is an integer number (1293552).

Almost surely, 2^28728315 is an apocalyptic number.

28728315 is an abundant number, since it is smaller than the sum of its proper divisors (33362181).

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

28728315 is a wasteful number, since it uses less digits than its factorization.

28728315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8320 (or 8317 counting only the distinct ones).

The product of its digits is 26880, while the sum is 36.

The square root of 28728315 is about 5359.8801292566. The cubic root of 28728315 is about 306.2692427170.

The spelling of 28728315 in words is "twenty-eight million, seven hundred twenty-eight thousand, three hundred fifteen".