28308730 has 8 divisors (see below), whose sum is σ = 50955732. Its totient is φ = 11323488.

The previous prime is 28308713. The next prime is 28308733. The reversal of 28308730 is 3780382.

It can be written as a sum of positive squares in 2 ways, for example, as 27342441 + 966289 = 5229^2 + 983^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 28308692 and 28308701.

It is not an unprimeable number, because it can be changed into a prime (28308733) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1415427 + ... + 1415446.

Almost surely, 2^28308730 is an apocalyptic number.

28308730 is a deficient number, since it is larger than the sum of its proper divisors (22647002).

28308730 is a wasteful number, since it uses less digits than its factorization.

28308730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2830880.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 28308730 is about 5320.5948915511. The cubic root of 28308730 is about 304.7708751274.

The spelling of 28308730 in words is "twenty-eight million, three hundred eight thousand, seven hundred thirty".