278918553340 has 96 divisors (see below), whose sum is σ = 708214510080. Its totient is φ = 90136053504.

The previous prime is 278918553337. The next prime is 278918553349. The reversal of 278918553340 is 43355819872.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (278918553349) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 257887 + ... + 790153.

It is an arithmetic number, because the mean of its divisors is an integer number (7377234480).

Almost surely, 2^278918553340 is an apocalyptic number.

278918553340 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 278918553340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (354107255040).

278918553340 is an abundant number, since it is smaller than the sum of its proper divisors (429295956740).

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

278918553340 is a wasteful number, since it uses less digits than its factorization.

278918553340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 532499 (or 532497 counting only the distinct ones).

The product of its (nonzero) digits is 7257600, while the sum is 55.

The spelling of 278918553340 in words is "two hundred seventy-eight billion, nine hundred eighteen million, five hundred fifty-three thousand, three hundred forty".