278510868240 has 160 divisors (see below), whose sum is σ = 942099987456. Its totient is φ = 67501524480.

The previous prime is 278510868239. The next prime is 278510868241. The reversal of 278510868240 is 42868015872.

It is an interprime number because it is at equal distance from previous prime (278510868239) and next prime (278510868241).

It is not an unprimeable number, because it can be changed into a prime (278510868241) 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, 13789189 + ... + 13809371.

Almost surely, 2^278510868240 is an apocalyptic number.

278510868240 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 278510868240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (471049993728).

278510868240 is an abundant number, since it is smaller than the sum of its proper divisors (663589119216).

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

278510868240 is a wasteful number, since it uses less digits than its factorization.

278510868240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25437 (or 25431 counting only the distinct ones).

The product of its (nonzero) digits is 1720320, while the sum is 51.

The spelling of 278510868240 in words is "two hundred seventy-eight billion, five hundred ten million, eight hundred sixty-eight thousand, two hundred forty".