28717730 has 16 divisors (see below), whose sum is σ = 52176960. Its totient is φ = 11379312.

The previous prime is 28717729. The next prime is 28717747. The reversal of 28717730 is 3771782.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12350 + ... + 14489.

It is an arithmetic number, because the mean of its divisors is an integer number (3261060).

Almost surely, 2^28717730 is an apocalyptic number.

28717730 is a deficient number, since it is larger than the sum of its proper divisors (23459230).

28717730 is a wasteful number, since it uses less digits than its factorization.

28717730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26953.

The product of its (nonzero) digits is 16464, while the sum is 35.

The square root of 28717730 is about 5358.8926094857. The cubic root of 28717730 is about 306.2316229428.

It can be divided in two parts, 2871 and 7730, that added together give a palindrome (10601).

The spelling of 28717730 in words is "twenty-eight million, seven hundred seventeen thousand, seven hundred thirty".