1691286228 has 18 divisors (see below), whose sum is σ = 4275195834. Its totient is φ = 563762064.

The previous prime is 1691286167. The next prime is 1691286281. The reversal of 1691286228 is 8226821961.

1691286228 is a `hidden beast` number, since 1 + 6 + 9 + 12 + 8 + 622 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 995276304 + 696009924 = 31548^2 + 26382^2 .

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 23490051 + ... + 23490122.

Almost surely, 2^1691286228 is an apocalyptic number.

1691286228 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1691286228 is an abundant number, since it is smaller than the sum of its proper divisors (2583909606).

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

1691286228 is a wasteful number, since it uses less digits than its factorization.

1691286228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46980183 (or 46980178 counting only the distinct ones).

The product of its digits is 165888, while the sum is 45.

The square root of 1691286228 is about 41125.2504916383. The cubic root of 1691286228 is about 1191.4405331018.

The spelling of 1691286228 in words is "one billion, six hundred ninety-one million, two hundred eighty-six thousand, two hundred twenty-eight".