280745963 has 4 divisors (see below), whose sum is σ = 283525728. Its totient is φ = 277966200.

The previous prime is 280745953. The next prime is 280745977. The reversal of 280745963 is 369547082.

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

It is a cyclic number.

It is not a de Polignac number, because 280745963 - 2⁴ = 280745947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (280745903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1389731 + ... + 1389932.

It is an arithmetic number, because the mean of its divisors is an integer number (70881432).

Almost surely, 2^280745963 is an apocalyptic number.

280745963 is a deficient number, since it is larger than the sum of its proper divisors (2779765).

280745963 is a wasteful number, since it uses less digits than its factorization.

280745963 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2779764.

The product of its (nonzero) digits is 362880, while the sum is 44.

The square root of 280745963 is about 16755.4756124677. The cubic root of 280745963 is about 654.7937217307.

The spelling of 280745963 in words is "two hundred eighty million, seven hundred forty-five thousand, nine hundred sixty-three".