280442628 has 48 divisors (see below), whose sum is σ = 728387520. Its totient is φ = 93312000.

The previous prime is 280442621. The next prime is 280442633. The reversal of 280442628 is 826244082.

It is a happy number.

280442628 is a `hidden beast` number, since 28 + 0 + 4 + 4 + 2 + 628 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 280442592 and 280442601.

It is not an unprimeable number, because it can be changed into a prime (280442621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67203 + ... + 71253.

It is an arithmetic number, because the mean of its divisors is an integer number (15174740).

Almost surely, 2^280442628 is an apocalyptic number.

It is an amenable number.

280442628 is an abundant number, since it is smaller than the sum of its proper divisors (447944892).

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

280442628 is a wasteful number, since it uses less digits than its factorization.

280442628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4705 (or 4697 counting only the distinct ones).

The product of its (nonzero) digits is 49152, while the sum is 36.

The square root of 280442628 is about 16746.4213490525. The cubic root of 280442628 is about 654.5578104359.

The spelling of 280442628 in words is "two hundred eighty million, four hundred forty-two thousand, six hundred twenty-eight".