280280047 has 4 divisors (see below), whose sum is σ = 292466160. Its totient is φ = 268093936.

The previous prime is 280280027. The next prime is 280280051. The reversal of 280280047 is 740082082.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 740082082 = 2 ⋅370041041.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-280280047 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280280027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6093022 + ... + 6093067.

It is an arithmetic number, because the mean of its divisors is an integer number (73116540).

Almost surely, 2^280280047 is an apocalyptic number.

280280047 is a deficient number, since it is larger than the sum of its proper divisors (12186113).

280280047 is a wasteful number, since it uses less digits than its factorization.

280280047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12186112.

The product of its (nonzero) digits is 7168, while the sum is 31.

The square root of 280280047 is about 16741.5664440338. The cubic root of 280280047 is about 654.4312970555.

The spelling of 280280047 in words is "two hundred eighty million, two hundred eighty thousand, forty-seven".