28715730 has 32 divisors (see below), whose sum is σ = 71915904. Its totient is φ = 7324416.

The previous prime is 28715711. The next prime is 28715741. The reversal of 28715730 is 3751782.

It is a junction number, because it is equal to n+sod(n) for n = 28715691 and 28715700.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20119 + ... + 21498.

It is an arithmetic number, because the mean of its divisors is an integer number (2247372).

Almost surely, 2^28715730 is an apocalyptic number.

28715730 is an abundant number, since it is smaller than the sum of its proper divisors (43200174).

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

28715730 is a wasteful number, since it uses less digits than its factorization.

28715730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41650.

The product of its (nonzero) digits is 11760, while the sum is 33.

The square root of 28715730 is about 5358.7060005192. The cubic root of 28715730 is about 306.2245137752.

The spelling of 28715730 in words is "twenty-eight million, seven hundred fifteen thousand, seven hundred thirty".