278831222912 has 72 divisors (see below), whose sum is σ = 610717342095. Its totient is φ = 126711594240.

The previous prime is 278831222911. The next prime is 278831222939. The reversal of 278831222912 is 219222138872.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in only one way, i.e., 139415611456 + 139415611456 = 373384^2 + 373384^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=373384.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (278831222911) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 65713463 + ... + 65717705.

Almost surely, 2^278831222912 is an apocalyptic number.

278831222912 is a gapful number since it is divisible by the number (22) 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 278831222912

278831222912 is an abundant number, since it is smaller than the sum of its proper divisors (331886119183).

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

278831222912 is an frugal number, since it uses more digits than its factorization.

278831222912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8522 (or 4256 counting only the distinct ones).

The product of its digits is 387072, while the sum is 47.

The spelling of 278831222912 in words is "two hundred seventy-eight billion, eight hundred thirty-one million, two hundred twenty-two thousand, nine hundred twelve".