278978454 has 48 divisors (see below), whose sum is σ = 639684864. Its totient is φ = 87687600.

The previous prime is 278978429. The next prime is 278978459. The reversal of 278978454 is 454879872.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 278978454.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (278978459) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24649 + ... + 34139.

It is an arithmetic number, because the mean of its divisors is an integer number (13326768).

Almost surely, 2^278978454 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 278978454, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (319842432).

278978454 is an abundant number, since it is smaller than the sum of its proper divisors (360706410).

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

278978454 is a wasteful number, since it uses less digits than its factorization.

278978454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9593 (or 9590 counting only the distinct ones).

The product of its digits is 4515840, while the sum is 54.

The square root of 278978454 is about 16702.6481133981. The cubic root of 278978454 is about 653.4166866325.

The spelling of 278978454 in words is "two hundred seventy-eight million, nine hundred seventy-eight thousand, four hundred fifty-four".