280145880 has 192 divisors, whose sum is σ = 1095494400. Its totient is φ = 60652800.

The previous prime is 280145867. The next prime is 280145881. The reversal of 280145880 is 88541082.

280145880 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280145881) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 44955 + ... + 50805.

It is an arithmetic number, because the mean of its divisors is an integer number (5705700).

Almost surely, 2^280145880 is an apocalyptic number.

280145880 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 280145880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (547747200).

280145880 is an abundant number, since it is smaller than the sum of its proper divisors (815348520).

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

280145880 is a wasteful number, since it uses less digits than its factorization.

280145880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5894 (or 5887 counting only the distinct ones).

The product of its (nonzero) digits is 20480, while the sum is 36.

The square root of 280145880 is about 16737.5589618080. The cubic root of 280145880 is about 654.3268573488.

The spelling of 280145880 in words is "two hundred eighty million, one hundred forty-five thousand, eight hundred eighty".