1280028231 has 32 divisors (see below), whose sum is σ = 1925376000. Its totient is φ = 840344544.

The previous prime is 1280028163. The next prime is 1280028263. The reversal of 1280028231 is 1328200821.

1280028231 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1280028231 - 2⁹ = 1280027719 is a prime.

It is a super-2 number, since 2×1280028231² = 3276944544313978722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 1280028195 and 1280028204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1280018231) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1392390 + ... + 1393308.

It is an arithmetic number, because the mean of its divisors is an integer number (60168000).

Almost surely, 2^1280028231 is an apocalyptic number.

1280028231 is a deficient number, since it is larger than the sum of its proper divisors (645347769).

1280028231 is an equidigital number, since it uses as much as digits as its factorization.

1280028231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1660 (or 1654 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 1280028231 is about 35777.4821780404. The cubic root of 1280028231 is about 1085.7750289463.

The spelling of 1280028231 in words is "one billion, two hundred eighty million, twenty-eight thousand, two hundred thirty-one".