28078765773 has 4 divisors (see below), whose sum is σ = 37438354368. Its totient is φ = 18719177180.

The previous prime is 28078765721. The next prime is 28078765783. The reversal of 28078765773 is 37756787082.

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 28078765773 - 2¹⁴ = 28078749389 is a prime.

It is a super-3 number, since 3×28078765773³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28078765703) 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, 4679794293 + ... + 4679794298.

It is an arithmetic number, because the mean of its divisors is an integer number (9359588592).

Almost surely, 2^28078765773 is an apocalyptic number.

It is an amenable number.

28078765773 is a deficient number, since it is larger than the sum of its proper divisors (9359588595).

28078765773 is an equidigital number, since it uses as much as digits as its factorization.

28078765773 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9359588594.

The product of its (nonzero) digits is 27659520, while the sum is 60.

The spelling of 28078765773 in words is "twenty-eight billion, seventy-eight million, seven hundred sixty-five thousand, seven hundred seventy-three".