278811339620 has 96 divisors (see below), whose sum is σ = 642550237056. Its totient is φ = 100780646400.

The previous prime is 278811339557. The next prime is 278811339623. The reversal of 278811339620 is 26933118872.

It is not an unprimeable number, because it can be changed into a prime (278811339623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 90905327 + ... + 90908393.

It is an arithmetic number, because the mean of its divisors is an integer number (6693231636).

Almost surely, 2^278811339620 is an apocalyptic number.

278811339620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 278811339620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (321275118528).

278811339620 is an abundant number, since it is smaller than the sum of its proper divisors (363738897436).

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

278811339620 is a wasteful number, since it uses less digits than its factorization.

278811339620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5421 (or 5419 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 50.

The spelling of 278811339620 in words is "two hundred seventy-eight billion, eight hundred eleven million, three hundred thirty-nine thousand, six hundred twenty".