28707329 has 8 divisors (see below), whose sum is σ = 32850048. Its totient is φ = 24575040.

The previous prime is 28707317. The next prime is 28707337. The reversal of 28707329 is 92370782.

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

It is not a de Polignac number, because 28707329 - 2⁴ = 28707313 is a prime.

It is a super-2 number, since 2×28707329² = 1648221476628482, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 28707292 and 28707301.

It is not an unprimeable number, because it can be changed into a prime (28707379) 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, 4649 + ... + 8889.

It is an arithmetic number, because the mean of its divisors is an integer number (4106256).

Almost surely, 2^28707329 is an apocalyptic number.

It is an amenable number.

28707329 is a deficient number, since it is larger than the sum of its proper divisors (4142719).

28707329 is an equidigital number, since it uses as much as digits as its factorization.

28707329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5215.

The product of its (nonzero) digits is 42336, while the sum is 38.

The square root of 28707329 is about 5357.9220785674. The cubic root of 28707329 is about 306.1946481109.

The spelling of 28707329 in words is "twenty-eight million, seven hundred seven thousand, three hundred twenty-nine".