1691868028 has 24 divisors (see below), whose sum is σ = 3059521920. Its totient is φ = 817776960.

The previous prime is 1691868023. The next prime is 1691868043. The reversal of 1691868028 is 8208681961.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1691868023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 118878 + ... + 132346.

It is an arithmetic number, because the mean of its divisors is an integer number (127480080).

Almost surely, 2^1691868028 is an apocalyptic number.

It is an amenable number.

1691868028 is a deficient number, since it is larger than the sum of its proper divisors (1367653892).

1691868028 is a wasteful number, since it uses less digits than its factorization.

1691868028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14517 (or 14515 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 49.

The square root of 1691868028 is about 41132.3233965698. The cubic root of 1691868028 is about 1191.5771353756.

The spelling of 1691868028 in words is "one billion, six hundred ninety-one million, eight hundred sixty-eight thousand, twenty-eight".