280645340 has 12 divisors (see below), whose sum is σ = 589355256. Its totient is φ = 112258128.

The previous prime is 280645307. The next prime is 280645349. The reversal of 280645340 is 43546082.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 280645297 and 280645306.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280645349) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7016114 + ... + 7016153.

It is an arithmetic number, because the mean of its divisors is an integer number (49112938).

Almost surely, 2^280645340 is an apocalyptic number.

280645340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

280645340 is an abundant number, since it is smaller than the sum of its proper divisors (308709916).

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

280645340 is a wasteful number, since it uses less digits than its factorization.

280645340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14032276 (or 14032274 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 32.

The square root of 280645340 is about 16752.4726533130. The cubic root of 280645340 is about 654.7154835243.

The spelling of 280645340 in words is "two hundred eighty million, six hundred forty-five thousand, three hundred forty".