280105047 has 10 divisors (see below), whose sum is σ = 418428648. Its totient is φ = 186736644.

The previous prime is 280105031. The next prime is 280105069. The reversal of 280105047 is 740501082.

It is not a de Polignac number, because 280105047 - 2⁴ = 280105031 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 280105047.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280105027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1728963 + ... + 1729124.

Almost surely, 2^280105047 is an apocalyptic number.

280105047 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

280105047 is a deficient number, since it is larger than the sum of its proper divisors (138323601).

280105047 is an equidigital number, since it uses as much as digits as its factorization.

280105047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3458099 (or 3458090 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 280105047 is about 16736.3391158282. The cubic root of 280105047 is about 654.2950650712.

The spelling of 280105047 in words is "two hundred eighty million, one hundred five thousand, forty-seven".