28910921313 has 8 divisors (see below), whose sum is σ = 38552853888. Its totient is φ = 19271468144.

The previous prime is 28910921279. The next prime is 28910921329. The reversal of 28910921313 is 31312901982.

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 28910921313 - 2¹³ = 28910913121 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28910921353) 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 7 ways as a sum of consecutive naturals, for example, 592470 + ... + 639407.

It is an arithmetic number, because the mean of its divisors is an integer number (4819106736).

Almost surely, 2^28910921313 is an apocalyptic number.

It is an amenable number.

28910921313 is a deficient number, since it is larger than the sum of its proper divisors (9641932575).

28910921313 is a wasteful number, since it uses less digits than its factorization.

28910921313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1239703.

The product of its (nonzero) digits is 23328, while the sum is 39.

The spelling of 28910921313 in words is "twenty-eight billion, nine hundred ten million, nine hundred twenty-one thousand, three hundred thirteen".