280380528 has 100 divisors (see below), whose sum is σ = 823869640. Its totient is φ = 92036736.

The previous prime is 280380493. The next prime is 280380539. The reversal of 280380528 is 825083082.

It is a super-2 number, since 2×280380528² = 157226480963117568, which contains 22 as substring.

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

It is a junction number, because it is equal to n+sod(n) for n = 280380492 and 280380501.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 85218 + ... + 88446.

Almost surely, 2^280380528 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 280380528, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (411934820).

280380528 is an abundant number, since it is smaller than the sum of its proper divisors (543489112).

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

280380528 is a wasteful number, since it uses less digits than its factorization.

280380528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3316 (or 3301 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 36.

The square root of 280380528 is about 16744.5671189195. The cubic root of 280380528 is about 654.5094927212.

The spelling of 280380528 in words is "two hundred eighty million, three hundred eighty thousand, five hundred twenty-eight".