278999982 has 48 divisors (see below), whose sum is σ = 635102208. Its totient is φ = 88347600.

The previous prime is 278999951. The next prime is 278999989. The reversal of 278999982 is 289999872.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (278999989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 60283 + ... + 64745.

It is an arithmetic number, because the mean of its divisors is an integer number (13231296).

Almost surely, 2^278999982 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 278999982, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (317551104).

278999982 is an abundant number, since it is smaller than the sum of its proper divisors (356102226).

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

278999982 is a wasteful number, since it uses less digits than its factorization.

278999982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4645 (or 4642 counting only the distinct ones).

The product of its digits is 11757312, while the sum is 63.

The square root of 278999982 is about 16703.2925496742. The cubic root of 278999982 is about 653.4334936564.

It can be divided in two parts, 27 and 8999982, that added together give a palindrome (9000009).

The spelling of 278999982 in words is "two hundred seventy-eight million, nine hundred ninety-nine thousand, nine hundred eighty-two".