280066445 has 4 divisors (see below), whose sum is σ = 336079740. Its totient is φ = 224053152.

The previous prime is 280066421. The next prime is 280066463. The reversal of 280066445 is 544660082.

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 62267881 + 217798564 = 7891^2 + 14758^2 .

It is a cyclic number.

It is not a de Polignac number, because 280066445 - 2¹⁶ = 280000909 is a prime.

It is a super-2 number, since 2×280066445² = 156874427229876050, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28006640 + ... + 28006649.

It is an arithmetic number, because the mean of its divisors is an integer number (84019935).

Almost surely, 2^280066445 is an apocalyptic number.

It is an amenable number.

280066445 is a deficient number, since it is larger than the sum of its proper divisors (56013295).

280066445 is an equidigital number, since it uses as much as digits as its factorization.

280066445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56013294.

The product of its (nonzero) digits is 46080, while the sum is 35.

The square root of 280066445 is about 16735.1858370321. The cubic root of 280066445 is about 654.2650069927.

The spelling of 280066445 in words is "two hundred eighty million, sixty-six thousand, four hundred forty-five".