281420728 has 32 divisors (see below), whose sum is σ = 545771520. Its totient is φ = 135900000.

The previous prime is 281420719. The next prime is 281420731. The reversal of 281420728 is 827024182.

It is a super-2 number, since 2×281420728² = 158395252296099968, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 281420693 and 281420702.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 185493 + ... + 187003.

It is an arithmetic number, because the mean of its divisors is an integer number (17055360).

Almost surely, 2^281420728 is an apocalyptic number.

It is an amenable number.

281420728 is a deficient number, since it is larger than the sum of its proper divisors (264350792).

281420728 is a wasteful number, since it uses less digits than its factorization.

281420728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2299 (or 2295 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 34.

The square root of 281420728 is about 16775.5991845299. The cubic root of 281420728 is about 655.3178947542.

The spelling of 281420728 in words is "two hundred eighty-one million, four hundred twenty thousand, seven hundred twenty-eight".