280425605 has 6 divisors (see below), whose sum is σ = 336555666. Its totient is φ = 224310528.

The previous prime is 280425581. The next prime is 280425611. The reversal of 280425605 is 506524082.

It can be written as a sum of positive squares in 3 ways, for example, as 28536964 + 251888641 = 5342^2 + 15871^2 .

It is not a de Polignac number, because 280425605 - 2¹⁴ = 280409221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 33701 + ... + 41189.

It is an arithmetic number, because the mean of its divisors is an integer number (56092611).

Almost surely, 2^280425605 is an apocalyptic number.

It is an amenable number.

280425605 is a deficient number, since it is larger than the sum of its proper divisors (56130061).

280425605 is an frugal number, since it uses more digits than its factorization.

280425605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14983 (or 7494 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 32.

The square root of 280425605 is about 16745.9130834959. The cubic root of 280425605 is about 654.5445661785.

Adding to 280425605 its reverse (506524082), we get a palindrome (786949687).

The spelling of 280425605 in words is "two hundred eighty million, four hundred twenty-five thousand, six hundred five".