278900020 has 96 divisors (see below), whose sum is σ = 686407680. Its totient is φ = 93225600.

The previous prime is 278899987. The next prime is 278900053. The reversal of 278900020 is 20009872.

278900020 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (278899987) and next prime (278900053).

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1669977 + ... + 1670143.

It is an arithmetic number, because the mean of its divisors is an integer number (7150080).

Almost surely, 2^278900020 is an apocalyptic number.

278900020 is a gapful number since it is divisible by the number (20) 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 278900020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (343203840).

278900020 is an abundant number, since it is smaller than the sum of its proper divisors (407507660).

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

278900020 is a wasteful number, since it uses less digits than its factorization.

278900020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 413 (or 411 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 278900020 is about 16700.2999973054. The cubic root of 278900020 is about 653.3554454777.

Adding to 278900020 its reverse (20009872), we get a palindrome (298909892).

The spelling of 278900020 in words is "two hundred seventy-eight million, nine hundred thousand, twenty".