280348728 has 64 divisors (see below), whose sum is σ = 768942720. Its totient is φ = 84470400.

The previous prime is 280348727. The next prime is 280348729. The reversal of 280348728 is 827843082.

It is an interprime number because it is at equal distance from previous prime (280348727) and next prime (280348729).

It is a self number, because there is not a number n which added to its sum of digits gives 280348728.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280348727) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44851 + ... + 50717.

It is an arithmetic number, because the mean of its divisors is an integer number (12014730).

Almost surely, 2^280348728 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 280348728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (384471360).

280348728 is an abundant number, since it is smaller than the sum of its proper divisors (488593992).

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

280348728 is a wasteful number, since it uses less digits than its factorization.

280348728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6068 (or 6064 counting only the distinct ones).

The product of its (nonzero) digits is 172032, while the sum is 42.

The square root of 280348728 is about 16743.6175302710. The cubic root of 280348728 is about 654.4847475544.

The spelling of 280348728 in words is "two hundred eighty million, three hundred forty-eight thousand, seven hundred twenty-eight".