280427685 has 16 divisors (see below), whose sum is σ = 451699200. Its totient is φ = 148556480.

The previous prime is 280427681. The next prime is 280427689. The reversal of 280427685 is 586724082.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (280427681) and next prime (280427689).

It is not a de Polignac number, because 280427685 - 2² = 280427681 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280427681) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60501 + ... + 64970.

It is an arithmetic number, because the mean of its divisors is an integer number (28231200).

Almost surely, 2^280427685 is an apocalyptic number.

It is an amenable number.

280427685 is a deficient number, since it is larger than the sum of its proper divisors (171271515).

280427685 is a wasteful number, since it uses less digits than its factorization.

280427685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125628.

The product of its (nonzero) digits is 215040, while the sum is 42.

The square root of 280427685 is about 16745.9751880862. The cubic root of 280427685 is about 654.5461844917.

The spelling of 280427685 in words is "two hundred eighty million, four hundred twenty-seven thousand, six hundred eighty-five".