28309130 has 8 divisors (see below), whose sum is σ = 50956452. Its totient is φ = 11323648.

The previous prime is 28309129. The next prime is 28309139. The reversal of 28309130 is 3190382.

It can be written as a sum of positive squares in 2 ways, for example, as 27699169 + 609961 = 5263^2 + 781^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 28309130.

It is not an unprimeable number, because it can be changed into a prime (28309139) 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, 1415447 + ... + 1415466.

Almost surely, 2^28309130 is an apocalyptic number.

28309130 is a deficient number, since it is larger than the sum of its proper divisors (22647322).

28309130 is a wasteful number, since it uses less digits than its factorization.

28309130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2830920.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 28309130 is about 5320.6324812000. The cubic root of 28309130 is about 304.7723105830.

The spelling of 28309130 in words is "twenty-eight million, three hundred nine thousand, one hundred thirty".