280964887 has 4 divisors (see below), whose sum is σ = 321102736. Its totient is φ = 240827040.

The previous prime is 280964839. The next prime is 280964897. The reversal of 280964887 is 788469082.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-280964887 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280964807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20068914 + ... + 20068927.

It is an arithmetic number, because the mean of its divisors is an integer number (80275684).

Almost surely, 2^280964887 is an apocalyptic number.

280964887 is a deficient number, since it is larger than the sum of its proper divisors (40137849).

280964887 is an equidigital number, since it uses as much as digits as its factorization.

280964887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40137848.

The product of its (nonzero) digits is 1548288, while the sum is 52.

The square root of 280964887 is about 16762.0072485368. The cubic root of 280964887 is about 654.9638789008.

The spelling of 280964887 in words is "two hundred eighty million, nine hundred sixty-four thousand, eight hundred eighty-seven".