28742128777805 has 8 divisors (see below), whose sum is σ = 34491251173344. Its totient is φ = 22993238595600.

The previous prime is 28742128777801. The next prime is 28742128777807. The reversal of 28742128777805 is 50877782124782.

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

It is not a de Polignac number, because 28742128777805 - 2² = 28742128777801 is a prime.

It is a super-2 number, since 2×28742128777805² (a number of 28 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 (28742128777801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57780911 + ... + 58276220.

It is an arithmetic number, because the mean of its divisors is an integer number (4311406396668).

Almost surely, 2^{28742128777805} is an apocalyptic number.

It is an amenable number.

28742128777805 is a deficient number, since it is larger than the sum of its proper divisors (5749122395539).

28742128777805 is a wasteful number, since it uses less digits than its factorization.

28742128777805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116106667.

The product of its (nonzero) digits is 196689920, while the sum is 68.

The spelling of 28742128777805 in words is "twenty-eight trillion, seven hundred forty-two billion, one hundred twenty-eight million, seven hundred seventy-seven thousand, eight hundred five".