280830816 has 72 divisors (see below), whose sum is σ = 912706704. Its totient is φ = 80236800.

The previous prime is 280830787. The next prime is 280830817. The reversal of 280830816 is 618038082.

It is a tau number, because it is divible by the number of its divisors (72).

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 (280830817) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 67635 + ... + 71666.

It is an arithmetic number, because the mean of its divisors is an integer number (12676482).

Almost surely, 2^280830816 is an apocalyptic number.

It is an amenable number.

280830816 is an abundant number, since it is smaller than the sum of its proper divisors (631875888).

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

280830816 is a wasteful number, since it uses less digits than its factorization.

280830816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139324 (or 139313 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 280830816 is about 16758.0075187953. The cubic root of 280830816 is about 654.8596836350.

Adding to 280830816 its reverse (618038082), we get a palindrome (898868898).

The spelling of 280830816 in words is "two hundred eighty million, eight hundred thirty thousand, eight hundred sixteen".