280673040 has 80 divisors (see below), whose sum is σ = 890353728. Its totient is φ = 73102848.

The previous prime is 280673033. The next prime is 280673087. The reversal of 280673040 is 40376082.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 280672989 and 280673007.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3279 + ... + 23918.

Almost surely, 2^280673040 is an apocalyptic number.

280673040 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 280673040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (445176864).

280673040 is an abundant number, since it is smaller than the sum of its proper divisors (609680688).

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

280673040 is a wasteful number, since it uses less digits than its factorization.

280673040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27256 (or 27250 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 30.

The square root of 280673040 is about 16753.2993765407. The cubic root of 280673040 is about 654.7370231922.

The spelling of 280673040 in words is "two hundred eighty million, six hundred seventy-three thousand, forty".