28381078311 has 32 divisors (see below), whose sum is σ = 39047754240. Its totient is φ = 18325440000.

The previous prime is 28381078291. The next prime is 28381078331. The reversal of 28381078311 is 11387018382.

It is an interprime number because it is at equal distance from previous prime (28381078291) and next prime (28381078331).

It is not a de Polignac number, because 28381078311 - 2¹⁰ = 28381077287 is a prime.

It is a super-2 number, since 2×28381078311² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28381078331) 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 31 ways as a sum of consecutive naturals, for example, 15757611 + ... + 15759411.

It is an arithmetic number, because the mean of its divisors is an integer number (1220242320).

Almost surely, 2^28381078311 is an apocalyptic number.

28381078311 is a deficient number, since it is larger than the sum of its proper divisors (10666675929).

28381078311 is a wasteful number, since it uses less digits than its factorization.

28381078311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2807.

The product of its (nonzero) digits is 64512, while the sum is 42.

The spelling of 28381078311 in words is "twenty-eight billion, three hundred eighty-one million, seventy-eight thousand, three hundred eleven".