280385112 has 128 divisors (see below), whose sum is σ = 842688000. Its totient is φ = 76059648.

The previous prime is 280385107. The next prime is 280385117. The reversal of 280385112 is 211583082.

It is an interprime number because it is at equal distance from previous prime (280385107) and next prime (280385117).

It is a super-2 number, since 2×280385112² = 157231622062505088, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 280385112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280385117) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 266764 + ... + 267812.

It is an arithmetic number, because the mean of its divisors is an integer number (6583500).

Almost surely, 2^280385112 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 280385112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (421344000).

280385112 is an abundant number, since it is smaller than the sum of its proper divisors (562302888).

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

280385112 is a wasteful number, since it uses less digits than its factorization.

280385112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1145 (or 1141 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 30.

The square root of 280385112 is about 16744.7039985782. The cubic root of 280385112 is about 654.5130596060.

The spelling of 280385112 in words is "two hundred eighty million, three hundred eighty-five thousand, one hundred twelve".