27878081779 has 8 divisors (see below), whose sum is σ = 28406654640. Its totient is φ = 27349604256.

The previous prime is 27878081767. The next prime is 27878081789. The reversal of 27878081779 is 97718087872.

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 27878081779 - 2⁵ = 27878081747 is a prime.

It is a super-2 number, since 2×27878081779² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 27878081779.

It is not an unprimeable number, because it can be changed into a prime (27878081789) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 908109 + ... + 938305.

It is an arithmetic number, because the mean of its divisors is an integer number (3550831830).

Almost surely, 2^27878081779 is an apocalyptic number.

27878081779 is a deficient number, since it is larger than the sum of its proper divisors (528572861).

27878081779 is a wasteful number, since it uses less digits than its factorization.

27878081779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47669.

The product of its (nonzero) digits is 22127616, while the sum is 64.

The spelling of 27878081779 in words is "twenty-seven billion, eight hundred seventy-eight million, eighty-one thousand, seven hundred seventy-nine".