280740303 has 8 divisors (see below), whose sum is σ = 415911600. Its totient is φ = 187160184.

The previous prime is 280740293. The next prime is 280740337. The reversal of 280740303 is 303047082.

It is not a de Polignac number, because 280740303 - 2⁹ = 280739791 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 10397789 = 280740303 / (2 + 8 + 0 + 7 + 4 + 0 + 3 + 0 + 3).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280740203) 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, 5198868 + ... + 5198921.

It is an arithmetic number, because the mean of its divisors is an integer number (51988950).

Almost surely, 2^280740303 is an apocalyptic number.

280740303 is a deficient number, since it is larger than the sum of its proper divisors (135171297).

280740303 is a wasteful number, since it uses less digits than its factorization.

280740303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10397798 (or 10397792 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 280740303 is about 16755.3067116063. The cubic root of 280740303 is about 654.7893213619.

Adding to 280740303 its reverse (303047082), we get a palindrome (583787385).

The spelling of 280740303 in words is "two hundred eighty million, seven hundred forty thousand, three hundred three".