278642104 has 64 divisors (see below), whose sum is σ = 599840640. Its totient is φ = 120207360.

The previous prime is 278642081. The next prime is 278642113. The reversal of 278642104 is 401246872.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a self number, because there is not a number n which added to its sum of digits gives 278642104.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 305409 + ... + 306319.

It is an arithmetic number, because the mean of its divisors is an integer number (9372510).

Almost surely, 2^278642104 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 278642104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (299920320).

278642104 is an abundant number, since it is smaller than the sum of its proper divisors (321198536).

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

278642104 is a wasteful number, since it uses less digits than its factorization.

278642104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1120 (or 1116 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 34.

The square root of 278642104 is about 16692.5763140385. The cubic root of 278642104 is about 653.1539840437.

Adding to 278642104 its reverse (401246872), we get a palindrome (679888976).

The spelling of 278642104 in words is "two hundred seventy-eight million, six hundred forty-two thousand, one hundred four".