280436013 has 120 divisors (see below), whose sum is σ = 519095808. Its totient is φ = 149688000.

The previous prime is 280435999. The next prime is 280436041. The reversal of 280436013 is 310634082.

It is a happy number.

It is not a de Polignac number, because 280436013 - 2⁹ = 280435501 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280436213) by changing a digit.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 3949768 + ... + 3949838.

Almost surely, 2^280436013 is an apocalyptic number.

It is an amenable number.

280436013 is a deficient number, since it is larger than the sum of its proper divisors (238659795).

280436013 is a wasteful number, since it uses less digits than its factorization.

280436013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149 (or 129 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 280436013 is about 16746.2238430041. The cubic root of 280436013 is about 654.5526638884.

The spelling of 280436013 in words is "two hundred eighty million, four hundred thirty-six thousand, thirteen".