28741780817 has 4 divisors (see below), whose sum is σ = 28961183856. Its totient is φ = 28522377780.

The previous prime is 28741780799. The next prime is 28741780831. The reversal of 28741780817 is 71808714782.

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 not a de Polignac number, because 28741780817 - 2¹⁴ = 28741764433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28741780217) 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, 109701323 + ... + 109701584.

It is an arithmetic number, because the mean of its divisors is an integer number (7240295964).

Almost surely, 2^28741780817 is an apocalyptic number.

It is an amenable number.

28741780817 is a deficient number, since it is larger than the sum of its proper divisors (219403039).

28741780817 is a wasteful number, since it uses less digits than its factorization.

28741780817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219403038.

The product of its (nonzero) digits is 1404928, while the sum is 53.

The spelling of 28741780817 in words is "twenty-eight billion, seven hundred forty-one million, seven hundred eighty thousand, eight hundred seventeen".