280428189 has 8 divisors (see below), whose sum is σ = 374454432. Its totient is φ = 186677040.

The previous prime is 280428119. The next prime is 280428193. The reversal of 280428189 is 981824082.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 280428189 - 2⁸ = 280427933 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 280428189.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280428119) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66382 + ... + 70479.

It is an arithmetic number, because the mean of its divisors is an integer number (46806804).

Almost surely, 2^280428189 is an apocalyptic number.

It is an amenable number.

280428189 is a deficient number, since it is larger than the sum of its proper divisors (94026243).

280428189 is a wasteful number, since it uses less digits than its factorization.

280428189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137547.

The product of its (nonzero) digits is 73728, while the sum is 42.

The square root of 280428189 is about 16745.9902364715. The cubic root of 280428189 is about 654.5465766202.

The spelling of 280428189 in words is "two hundred eighty million, four hundred twenty-eight thousand, one hundred eighty-nine".