280281428 has 24 divisors (see below), whose sum is σ = 563231424. Its totient is φ = 119548800.

The previous prime is 280281389. The next prime is 280281457. The reversal of 280281428 is 824182082.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17813 + ... + 29628.

It is an arithmetic number, because the mean of its divisors is an integer number (23467976).

Almost surely, 2^280281428 is an apocalyptic number.

280281428 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

280281428 is an abundant number, since it is smaller than the sum of its proper divisors (282949996).

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

280281428 is a wasteful number, since it uses less digits than its factorization.

280281428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47663 (or 47661 counting only the distinct ones).

The product of its (nonzero) digits is 16384, while the sum is 35.

The square root of 280281428 is about 16741.6076886301. The cubic root of 280281428 is about 654.4323718949.

The spelling of 280281428 in words is "two hundred eighty million, two hundred eighty-one thousand, four hundred twenty-eight".