280730516 has 48 divisors (see below), whose sum is σ = 544864320. Its totient is φ = 125502720.

The previous prime is 280730477. The next prime is 280730519. The reversal of 280730516 is 615037082.

It is a happy number.

It is a super-2 number, since 2×280730516² = 157619245227252512, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280730519) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1204736 + ... + 1204968.

It is an arithmetic number, because the mean of its divisors is an integer number (11351340).

Almost surely, 2^280730516 is an apocalyptic number.

It is an amenable number.

280730516 is a deficient number, since it is larger than the sum of its proper divisors (264133804).

280730516 is a wasteful number, since it uses less digits than its factorization.

280730516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 584 (or 582 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 280730516 is about 16755.0146523362. The cubic root of 280730516 is about 654.7817123160.

Adding to 280730516 its reverse (615037082), we get a palindrome (895767598).

The spelling of 280730516 in words is "two hundred eighty million, seven hundred thirty thousand, five hundred sixteen".