1280628 has 18 divisors (see below), whose sum is σ = 3237234. Its totient is φ = 426864.

The previous prime is 1280623. The next prime is 1280633. The reversal of 1280628 is 8260821.

It is an interprime number because it is at equal distance from previous prime (1280623) and next prime (1280633).

It can be written as a sum of positive squares in only one way, i.e., 898704 + 381924 = 948^2 + 618^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1280623) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17751 + ... + 17822.

2^1280628 is an apocalyptic number.

1280628 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1280628 is an abundant number, since it is smaller than the sum of its proper divisors (1956606).

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

1280628 is a wasteful number, since it uses less digits than its factorization.

1280628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35583 (or 35578 counting only the distinct ones).

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

The square root of 1280628 is about 1131.6483552765. The cubic root of 1280628 is about 108.5944585759.

The spelling of 1280628 in words is "one million, two hundred eighty thousand, six hundred twenty-eight".