280605987 has 12 divisors (see below), whose sum is σ = 411029424. Its totient is φ = 184435440.

The previous prime is 280605973. The next prime is 280606019. The reversal of 280605987 is 789506082.

It is not a de Polignac number, because 280605987 - 2⁴ = 280605971 is a prime.

It is not an unprimeable number, because it can be changed into a prime (280605907) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 218928 + ... + 220205.

It is an arithmetic number, because the mean of its divisors is an integer number (34252452).

Almost surely, 2^280605987 is an apocalyptic number.

280605987 is a deficient number, since it is larger than the sum of its proper divisors (130423437).

280605987 is a wasteful number, since it uses less digits than its factorization.

280605987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 439210 (or 439207 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The square root of 280605987 is about 16751.2980691050. The cubic root of 280605987 is about 654.6848799841.

The spelling of 280605987 in words is "two hundred eighty million, six hundred five thousand, nine hundred eighty-seven".