280121796 has 18 divisors (see below), whose sum is σ = 708085742. Its totient is φ = 93373920.

The previous prime is 280121791. The next prime is 280121861. The reversal of 280121796 is 697121082.

It can be written as a sum of positive squares in only one way, i.e., 163481796 + 116640000 = 12786^2 + 10800^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 7781161 = 280121796 / (2 + 8 + 0 + 1 + 2 + 1 + 7 + 9 + 6).

It is a self number, because there is not a number n which added to its sum of digits gives 280121796.

It is not an unprimeable number, because it can be changed into a prime (280121791) 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 5 ways as a sum of consecutive naturals, for example, 3890545 + ... + 3890616.

Almost surely, 2^280121796 is an apocalyptic number.

It is an amenable number.

280121796 is an abundant number, since it is smaller than the sum of its proper divisors (427963946).

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

280121796 is a wasteful number, since it uses less digits than its factorization.

280121796 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7781171 (or 7781166 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 280121796 is about 16736.8394865936. The cubic root of 280121796 is about 654.3081060948.

The spelling of 280121796 in words is "two hundred eighty million, one hundred twenty-one thousand, seven hundred ninety-six".