280136668 has 12 divisors (see below), whose sum is σ = 560273392. Its totient is φ = 120058560.

The previous prime is 280136629. The next prime is 280136669. The reversal of 280136668 is 866631082.

280136668 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 280136668.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280136669) 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, 5002413 + ... + 5002468.

Almost surely, 2^280136668 is an apocalyptic number.

280136668 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

280136668 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

280136668 is a wasteful number, since it uses less digits than its factorization.

280136668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10004892 (or 10004890 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 40.

The square root of 280136668 is about 16737.2837700745. The cubic root of 280136668 is about 654.3196852223.

The spelling of 280136668 in words is "two hundred eighty million, one hundred thirty-six thousand, six hundred sixty-eight".