278424720840 has 256 divisors, whose sum is σ = 978727680000. Its totient is φ = 63336349440.

The previous prime is 278424720803. The next prime is 278424720911. The reversal of 278424720840 is 48027424872.

It is a self number, because there is not a number n which added to its sum of digits gives 278424720840.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 8668731 + ... + 8700789.

It is an arithmetic number, because the mean of its divisors is an integer number (3823155000).

Almost surely, 2^278424720840 is an apocalyptic number.

278424720840 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 278424720840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (489363840000).

278424720840 is an abundant number, since it is smaller than the sum of its proper divisors (700302959160).

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

278424720840 is a wasteful number, since it uses less digits than its factorization.

278424720840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32305 (or 32287 counting only the distinct ones).

The product of its (nonzero) digits is 1605632, while the sum is 48.

The spelling of 278424720840 in words is "two hundred seventy-eight billion, four hundred twenty-four million, seven hundred twenty thousand, eight hundred forty".