278268012 has 72 divisors (see below), whose sum is σ = 783724032. Its totient is φ = 82524000.

The previous prime is 278267981. The next prime is 278268047. The reversal of 278268012 is 210862872.

It is a happy number.

It is a super-3 number, since 3×278268012³ (a number of 26 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11137 + ... + 26087.

It is an arithmetic number, because the mean of its divisors is an integer number (10885056).

Almost surely, 2^278268012 is an apocalyptic number.

278268012 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 278268012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (391862016).

278268012 is an abundant number, since it is smaller than the sum of its proper divisors (505456020).

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

278268012 is a wasteful number, since it uses less digits than its factorization.

278268012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15019 (or 15014 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 278268012 is about 16681.3672101540. The cubic root of 278268012 is about 652.8615550285.

The spelling of 278268012 in words is "two hundred seventy-eight million, two hundred sixty-eight thousand, twelve".