28728716530 has 8 divisors (see below), whose sum is σ = 51711689772. Its totient is φ = 11491486608.

The previous prime is 28728716519. The next prime is 28728716537. The reversal of 28728716530 is 3561782782.

It can be written as a sum of positive squares in 2 ways, for example, as 24423125841 + 4305590689 = 156279^2 + 65617^2 .

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

It is a super-2 number, since 2×28728716530² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28728716537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1436435817 + ... + 1436435836.

Almost surely, 2^28728716530 is an apocalyptic number.

28728716530 is a deficient number, since it is larger than the sum of its proper divisors (22982973242).

28728716530 is a wasteful number, since it uses less digits than its factorization.

28728716530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2872871660.

The product of its (nonzero) digits is 1128960, while the sum is 49.

The spelling of 28728716530 in words is "twenty-eight billion, seven hundred twenty-eight million, seven hundred sixteen thousand, five hundred thirty".