280781128320 has 1024 divisors, whose sum is σ = 1207113891840. Its totient is φ = 53721169920.

The previous prime is 280781128237. The next prime is 280781128373. The reversal of 280781128320 is 23821187082.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 118122972 + ... + 118125348.

It is an arithmetic number, because the mean of its divisors is an integer number (1178822160).

Almost surely, 2^280781128320 is an apocalyptic number.

280781128320 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 280781128320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (603556945920).

280781128320 is an abundant number, since it is smaller than the sum of its proper divisors (926332763520).

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

280781128320 is a wasteful number, since it uses less digits than its factorization.

280781128320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2481 (or 2469 counting only the distinct ones).

The product of its (nonzero) digits is 86016, while the sum is 42.

The spelling of 280781128320 in words is "two hundred eighty billion, seven hundred eighty-one million, one hundred twenty-eight thousand, three hundred twenty".