28312754909091 has 32 divisors (see below), whose sum is σ = 40656594228480. Its totient is φ = 17460255292416.

The previous prime is 28312754909081. The next prime is 28312754909099. The reversal of 28312754909091 is 19090945721382.

It is not a de Polignac number, because 28312754909091 - 2⁶ = 28312754909027 is a prime.

It is a super-2 number, since 2×28312754909091² (a number of 28 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28312754909099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14062495 + ... + 15949271.

It is an arithmetic number, because the mean of its divisors is an integer number (1270518569640).

Almost surely, 2^{28312754909091} is an apocalyptic number.

28312754909091 is a deficient number, since it is larger than the sum of its proper divisors (12343839319389).

28312754909091 is a wasteful number, since it uses less digits than its factorization.

28312754909091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1891843.

The product of its (nonzero) digits is 9797760, while the sum is 60.

The spelling of 28312754909091 in words is "twenty-eight trillion, three hundred twelve billion, seven hundred fifty-four million, nine hundred nine thousand, ninety-one".