280838920 has 32 divisors (see below), whose sum is σ = 652273920. Its totient is φ = 108711360.

The previous prime is 280838881. The next prime is 280838923. The reversal of 280838920 is 29838082.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (280838923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 112002 + ... + 114481.

It is an arithmetic number, because the mean of its divisors is an integer number (20383560).

Almost surely, 2^280838920 is an apocalyptic number.

280838920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

280838920 is an abundant number, since it is smaller than the sum of its proper divisors (371435000).

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

280838920 is a wasteful number, since it uses less digits than its factorization.

280838920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226525 (or 226521 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 40.

The square root of 280838920 is about 16758.2493119061. The cubic root of 280838920 is about 654.8659827203.

The spelling of 280838920 in words is "two hundred eighty million, eight hundred thirty-eight thousand, nine hundred twenty".