280280138 has 8 divisors (see below), whose sum is σ = 420694560. Its totient is φ = 140048620.

The previous prime is 280280131. The next prime is 280280167. The reversal of 280280138 is 831082082.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (280280131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41828 + ... + 48063.

It is an arithmetic number, because the mean of its divisors is an integer number (52586820).

Almost surely, 2^280280138 is an apocalyptic number.

280280138 is a deficient number, since it is larger than the sum of its proper divisors (140414422).

280280138 is a wasteful number, since it uses less digits than its factorization.

280280138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91452.

The product of its (nonzero) digits is 6144, while the sum is 32.

The square root of 280280138 is about 16741.5691618199. The cubic root of 280280138 is about 654.4313678813.

The spelling of 280280138 in words is "two hundred eighty million, two hundred eighty thousand, one hundred thirty-eight".