278020518864 has 160 divisors (see below), whose sum is σ = 796907328000. Its totient is φ = 82810252800.

The previous prime is 278020518817. The next prime is 278020518869. The reversal of 278020518864 is 468815020872.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (278020518869) 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 31 ways as a sum of consecutive naturals, for example, 79455387 + ... + 79458885.

It is an arithmetic number, because the mean of its divisors is an integer number (4980670800).

Almost surely, 2^278020518864 is an apocalyptic number.

278020518864 is a gapful number since it is divisible by the number (24) 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 278020518864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (398453664000).

278020518864 is an abundant number, since it is smaller than the sum of its proper divisors (518886809136).

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

278020518864 is a wasteful number, since it uses less digits than its factorization.

278020518864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6049 (or 6043 counting only the distinct ones).

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

The spelling of 278020518864 in words is "two hundred seventy-eight billion, twenty million, five hundred eighteen thousand, eight hundred sixty-four".