278855265040 has 80 divisors (see below), whose sum is σ = 708237080640. Its totient is φ = 101264463360.

The previous prime is 278855265023. The next prime is 278855265041. The reversal of 278855265040 is 40562558872.

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (278855265041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 435922 + ... + 864718.

It is an arithmetic number, because the mean of its divisors is an integer number (8852963508).

Almost surely, 2^278855265040 is an apocalyptic number.

278855265040 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 278855265040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (354118540320).

278855265040 is an abundant number, since it is smaller than the sum of its proper divisors (429381815600).

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

278855265040 is a wasteful number, since it uses less digits than its factorization.

278855265040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 429560 (or 429554 counting only the distinct ones).

The product of its (nonzero) digits is 5376000, while the sum is 52.

It can be divided in two parts, 27885 and 5265040, that added together give a palindrome (5292925).

The spelling of 278855265040 in words is "two hundred seventy-eight billion, eight hundred fifty-five million, two hundred sixty-five thousand, forty".