1928781932833 has 4 divisors (see below), whose sum is σ = 2204322208960. Its totient is φ = 1653241656708.

The previous prime is 1928781932827. The next prime is 1928781932843. The reversal of 1928781932833 is 3382391878291.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1928781932833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1928781932843) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 137770138053 + ... + 137770138066.

It is an arithmetic number, because the mean of its divisors is an integer number (551080552240).

Almost surely, 2^{1928781932833} is an apocalyptic number.

It is an amenable number.

1928781932833 is a deficient number, since it is larger than the sum of its proper divisors (275540276127).

1928781932833 is an equidigital number, since it uses as much as digits as its factorization.

1928781932833 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275540276126.

The product of its digits is 31352832, while the sum is 64.

The spelling of 1928781932833 in words is "one trillion, nine hundred twenty-eight billion, seven hundred eighty-one million, nine hundred thirty-two thousand, eight hundred thirty-three".