1991692675728 has 60 divisors (see below), whose sum is σ = 6370255148608. Its totient is φ = 569055049920.

The previous prime is 1991692675727. The next prime is 1991692675733. The reversal of 1991692675728 is 8275762961991.

1991692675728 is a `hidden beast` number, since 19 + 9 + 16 + 9 + 26 + 7 + 572 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is not an unprimeable number, because it can be changed into a prime (1991692675727) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 987941788 + ... + 987943803.

Almost surely, 2^{1991692675728} is an apocalyptic number.

1991692675728 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1991692675728 is an abundant number, since it is smaller than the sum of its proper divisors (4378562472880).

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

1991692675728 is a wasteful number, since it uses less digits than its factorization.

1991692675728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1975885612 (or 1975885603 counting only the distinct ones).

The product of its digits is 205752960, while the sum is 72.

The spelling of 1991692675728 in words is "one trillion, nine hundred ninety-one billion, six hundred ninety-two million, six hundred seventy-five thousand, seven hundred twenty-eight".