278426148 has 144 divisors (see below), whose sum is σ = 877556736. Its totient is φ = 66718080.

The previous prime is 278426131. The next prime is 278426149. The reversal of 278426148 is 841624872.

It is a super-2 number, since 2×278426148² = 155042239780235808, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (278426149) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 155265 + ... + 157047.

It is an arithmetic number, because the mean of its divisors is an integer number (6094144).

Almost surely, 2^278426148 is an apocalyptic number.

278426148 is a gapful number since it is divisible by the number (28) 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 278426148, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (438778368).

278426148 is an abundant number, since it is smaller than the sum of its proper divisors (599130588).

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

278426148 is a wasteful number, since it uses less digits than its factorization.

278426148 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1834 (or 1819 counting only the distinct ones).

The product of its digits is 172032, while the sum is 42.

The square root of 278426148 is about 16686.1064361942. The cubic root of 278426148 is about 652.9852024473.

It can be divided in two parts, 278 and 426148, that added together give a triangular number (426426 = T₉₂₃).

The spelling of 278426148 in words is "two hundred seventy-eight million, four hundred twenty-six thousand, one hundred forty-eight".