280405696 has 56 divisors (see below), whose sum is σ = 589019904. Its totient is φ = 132168960.

The previous prime is 280405693. The next prime is 280405703. The reversal of 280405696 is 696504082.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (280405693) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 103171 + ... + 105853.

Almost surely, 2^280405696 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 280405696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (294509952).

280405696 is an abundant number, since it is smaller than the sum of its proper divisors (308614208).

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

280405696 is a wasteful number, since it uses less digits than its factorization.

280405696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2789 (or 2779 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 40.

The square root of 280405696 is about 16745.3186293961. The cubic root of 280405696 is about 654.5290758715.

The spelling of 280405696 in words is "two hundred eighty million, four hundred five thousand, six hundred ninety-six".