28728887311 has 8 divisors (see below), whose sum is σ = 29983075200. Its totient is φ = 27475124952.

The previous prime is 28728887303. The next prime is 28728887347. The reversal of 28728887311 is 11378882782.

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

It is a cyclic number.

It is not a de Polignac number, because 28728887311 - 2³ = 28728887303 is a prime.

It is a super-2 number, since 2×28728887311² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28728888311) 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, 35640 + ... + 242338.

It is an arithmetic number, because the mean of its divisors is an integer number (3747884400).

Almost surely, 2^28728887311 is an apocalyptic number.

28728887311 is a deficient number, since it is larger than the sum of its proper divisors (1254187889).

28728887311 is a wasteful number, since it uses less digits than its factorization.

28728887311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212765.

The product of its digits is 2408448, while the sum is 55.

The spelling of 28728887311 in words is "twenty-eight billion, seven hundred twenty-eight million, eight hundred eighty-seven thousand, three hundred eleven".