1286628 has 72 divisors (see below), whose sum is σ = 3713472. Its totient is φ = 339456.

The previous prime is 1286617. The next prime is 1286629. The reversal of 1286628 is 8266821.

It is a super-2 number, since 2×1286628² = 3310823220768, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1286629) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24250 + ... + 24302.

It is an arithmetic number, because the mean of its divisors is an integer number (51576).

2^1286628 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 1286628, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1856736).

1286628 is an abundant number, since it is smaller than the sum of its proper divisors (2426844).

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

1286628 is a wasteful number, since it uses less digits than its factorization.

1286628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101 (or 82 counting only the distinct ones).

The product of its digits is 9216, while the sum is 33.

The square root of 1286628 is about 1134.2962575976. The cubic root of 1286628 is about 108.7637900336.

The spelling of 1286628 in words is "one million, two hundred eighty-six thousand, six hundred twenty-eight".