191513545728 has 88 divisors (see below), whose sum is σ = 513275096880. Its totient is φ = 63484968960.

The previous prime is 191513545709. The next prime is 191513545753. The reversal of 191513545728 is 827545315191.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 383818 + ... + 728246.

Almost surely, 2^191513545728 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 191513545728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (256637548440).

191513545728 is an abundant number, since it is smaller than the sum of its proper divisors (321761551152).

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

191513545728 is a wasteful number, since it uses less digits than its factorization.

191513545728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344633 (or 344615 counting only the distinct ones).

The product of its digits is 1512000, while the sum is 51.

The spelling of 191513545728 in words is "one hundred ninety-one billion, five hundred thirteen million, five hundred forty-five thousand, seven hundred twenty-eight".