278749461860 has 48 divisors (see below), whose sum is σ = 613380902400. Its totient is φ = 106205683584.

The previous prime is 278749461829. The next prime is 278749461863. The reversal of 278749461860 is 68164947872.

It is a Smith number, since the sum of its digits (62) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 278749461793 and 278749461802.

It is not an unprimeable number, because it can be changed into a prime (278749461863) 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, 1157795 + ... + 1377674.

It is an arithmetic number, because the mean of its divisors is an integer number (12778768800).

Almost surely, 2^278749461860 is an apocalyptic number.

278749461860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

278749461860 is an abundant number, since it is smaller than the sum of its proper divisors (334631440540).

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

278749461860 is a wasteful number, since it uses less digits than its factorization.

278749461860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2535740 (or 2535738 counting only the distinct ones).

The product of its (nonzero) digits is 32514048, while the sum is 62.

The spelling of 278749461860 in words is "two hundred seventy-eight billion, seven hundred forty-nine million, four hundred sixty-one thousand, eight hundred sixty".