191302988640 has 48 divisors (see below), whose sum is σ = 602604415728. Its totient is φ = 51014130176.

The previous prime is 191302988633. The next prime is 191302988671. The reversal of 191302988640 is 46889203191.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent 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, 199273467 + ... + 199274426.

It is an arithmetic number, because the mean of its divisors is an integer number (12554258661).

Almost surely, 2^191302988640 is an apocalyptic number.

191302988640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

191302988640 is an abundant number, since it is smaller than the sum of its proper divisors (411301427088).

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

191302988640 is a wasteful number, since it uses less digits than its factorization.

191302988640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398547911 (or 398547903 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 51.

The spelling of 191302988640 in words is "one hundred ninety-one billion, three hundred two million, nine hundred eighty-eight thousand, six hundred forty".