1091628 has 18 divisors (see below), whose sum is σ = 2759484. Its totient is φ = 363864.

The previous prime is 1091627. The next prime is 1091633. The reversal of 1091628 is 8261901.

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

It is not an unprimeable number, because it can be changed into a prime (1091627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 15126 + ... + 15197.

2^1091628 is an apocalyptic number.

1091628 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1091628 is an abundant number, since it is smaller than the sum of its proper divisors (1667856).

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

1091628 is a wasteful number, since it uses less digits than its factorization.

1091628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30333 (or 30328 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 1091628 is about 1044.8100305797. The cubic root of 1091628 is about 102.9654579872.

The spelling of 1091628 in words is "one million, ninety-one thousand, six hundred twenty-eight".