278255025840 has 320 divisors, whose sum is σ = 991376547840. Its totient is φ = 63851166720.

The previous prime is 278255025817. The next prime is 278255025847. The reversal of 278255025840 is 48520552872.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 278255025840.

It is not an unprimeable number, because it can be changed into a prime (278255025847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 113711497 + ... + 113713943.

It is an arithmetic number, because the mean of its divisors is an integer number (3098051712).

Almost surely, 2^278255025840 is an apocalyptic number.

278255025840 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 278255025840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (495688273920).

278255025840 is an abundant number, since it is smaller than the sum of its proper divisors (713121522000).

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

278255025840 is a wasteful number, since it uses less digits than its factorization.

278255025840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4760 (or 4754 counting only the distinct ones).

The product of its (nonzero) digits is 1792000, while the sum is 48.

The spelling of 278255025840 in words is "two hundred seventy-eight billion, two hundred fifty-five million, twenty-five thousand, eight hundred forty".