278256620 has 24 divisors (see below), whose sum is σ = 603189888. Its totient is φ = 107712000.

The previous prime is 278256611. The next prime is 278256623. The reversal of 278256620 is 26652872.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (278256623) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 223781 + ... + 225020.

It is an arithmetic number, because the mean of its divisors is an integer number (25132912).

Almost surely, 2^278256620 is an apocalyptic number.

278256620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

278256620 is an abundant number, since it is smaller than the sum of its proper divisors (324933268).

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

278256620 is a wasteful number, since it uses less digits than its factorization.

278256620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 448841 (or 448839 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 38.

The square root of 278256620 is about 16681.0257478370. The cubic root of 278256620 is about 652.8526457516.

The spelling of 278256620 in words is "two hundred seventy-eight million, two hundred fifty-six thousand, six hundred twenty".