280278473 has 4 divisors (see below), whose sum is σ = 296765460. Its totient is φ = 263791488.

The previous prime is 280278451. The next prime is 280278503. The reversal of 280278473 is 374872082.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 130142464 + 150136009 = 11408^2 + 12253^2 .

It is a cyclic number.

It is not a de Polignac number, because 280278473 - 2¹⁰ = 280277449 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 280278473.

It is not an unprimeable number, because it can be changed into a prime (280278433) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8243468 + ... + 8243501.

It is an arithmetic number, because the mean of its divisors is an integer number (74191365).

Almost surely, 2^280278473 is an apocalyptic number.

It is an amenable number.

280278473 is a deficient number, since it is larger than the sum of its proper divisors (16486987).

280278473 is a wasteful number, since it uses less digits than its factorization.

280278473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16486986.

The product of its (nonzero) digits is 150528, while the sum is 41.

The square root of 280278473 is about 16741.5194352245. The cubic root of 280278473 is about 654.4300719988.

The spelling of 280278473 in words is "two hundred eighty million, two hundred seventy-eight thousand, four hundred seventy-three".