278575878 has 48 divisors (see below), whose sum is σ = 654136560. Its totient is φ = 78853824.

The previous prime is 278575867. The next prime is 278575879. The reversal of 278575878 is 878575872.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (278575879) 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, 27700 + ... + 36392.

It is an arithmetic number, because the mean of its divisors is an integer number (13627845).

Almost surely, 2^278575878 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 278575878, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (327068280).

278575878 is an abundant number, since it is smaller than the sum of its proper divisors (375560682).

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

278575878 is a wasteful number, since it uses less digits than its factorization.

278575878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8821 (or 8814 counting only the distinct ones).

The product of its digits is 8780800, while the sum is 57.

The square root of 278575878 is about 16690.5924999684. The cubic root of 278575878 is about 653.1022340240.

The spelling of 278575878 in words is "two hundred seventy-eight million, five hundred seventy-five thousand, eight hundred seventy-eight".