281023628 has 6 divisors (see below), whose sum is σ = 491791356. Its totient is φ = 140511812.

The previous prime is 281023627. The next prime is 281023657. The reversal of 281023628 is 826320182.

It is a junction number, because it is equal to n+sod(n) for n = 281023594 and 281023603.

It is not an unprimeable number, because it can be changed into a prime (281023627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35127950 + ... + 35127957.

It is an arithmetic number, because the mean of its divisors is an integer number (81965226).

Almost surely, 2^281023628 is an apocalyptic number.

It is an amenable number.

281023628 is a deficient number, since it is larger than the sum of its proper divisors (210767728).

281023628 is a wasteful number, since it uses less digits than its factorization.

281023628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70255911 (or 70255909 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 281023628 is about 16763.7593635795. The cubic root of 281023628 is about 655.0095198974.

The spelling of 281023628 in words is "two hundred eighty-one million, twenty-three thousand, six hundred twenty-eight".