280640075 has 12 divisors (see below), whose sum is σ = 348266400. Its totient is φ = 224336160.

The previous prime is 280640071. The next prime is 280640111. The reversal of 280640075 is 570046082.

It is not a de Polignac number, because 280640075 - 2² = 280640071 is a prime.

It is not an unprimeable number, because it can be changed into a prime (280640071) 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, 35102 + ... + 42348.

It is an arithmetic number, because the mean of its divisors is an integer number (29022200).

Almost surely, 2^280640075 is an apocalyptic number.

280640075 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

280640075 is a deficient number, since it is larger than the sum of its proper divisors (67626325).

280640075 is a wasteful number, since it uses less digits than its factorization.

280640075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8806 (or 8801 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 32.

The square root of 280640075 is about 16752.3155115942. The cubic root of 280640075 is about 654.7113892719.

The spelling of 280640075 in words is "two hundred eighty million, six hundred forty thousand, seventy-five".