278297538480 has 960 divisors, whose sum is σ = 1114041696768. Its totient is φ = 63959777280.

The previous prime is 278297538443. The next prime is 278297538499. The reversal of 278297538480 is 84835792872.

278297538480 is a `hidden beast` number, since 2 + 7 + 8 + 2 + 97 + 538 + 4 + 8 + 0 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 906506487 + ... + 906506793.

Almost surely, 2^278297538480 is an apocalyptic number.

278297538480 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 278297538480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (557020848384).

278297538480 is an abundant number, since it is smaller than the sum of its proper divisors (835744158288).

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

278297538480 is a wasteful number, since it uses less digits than its factorization.

278297538480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 576 (or 558 counting only the distinct ones).

The product of its (nonzero) digits is 54190080, while the sum is 63.

The spelling of 278297538480 in words is "two hundred seventy-eight billion, two hundred ninety-seven million, five hundred thirty-eight thousand, four hundred eighty".