27778305558 has 64 divisors (see below), whose sum is σ = 63360887040. Its totient is φ = 8064064512.

The previous prime is 27778305547. The next prime is 27778305587. The reversal of 27778305558 is 85550387772.

It is a super-3 number, since 3×27778305558³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (57).

27778305558 is a modest number, since divided by 305558 gives 27778 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 27778305498 and 27778305507.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 83335 + ... + 250002.

It is an arithmetic number, because the mean of its divisors is an integer number (990013860).

Almost surely, 2^27778305558 is an apocalyptic number.

27778305558 is an abundant number, since it is smaller than the sum of its proper divisors (35582581482).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

27778305558 is a wasteful number, since it uses less digits than its factorization.

27778305558 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333421.

The product of its (nonzero) digits is 16464000, while the sum is 57.

It can be divided in two parts, 27778 and 305558, that added together give a triangular number (333336 = T₈₁₆).

The spelling of 27778305558 in words is "twenty-seven billion, seven hundred seventy-eight million, three hundred five thousand, five hundred fifty-eight".