187891942648 has 64 divisors (see below), whose sum is σ = 367460997120. Its totient is φ = 89967542400.

The previous prime is 187891942627. The next prime is 187891942649. The reversal of 187891942648 is 846249198781.

It is a super-2 number, since 2×187891942648² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (187891942649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28204438 + ... + 28211098.

It is an arithmetic number, because the mean of its divisors is an integer number (5741578080).

Almost surely, 2^187891942648 is an apocalyptic number.

It is an amenable number.

187891942648 is a deficient number, since it is larger than the sum of its proper divisors (179569054472).

187891942648 is a wasteful number, since it uses less digits than its factorization.

187891942648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7868 (or 7864 counting only the distinct ones).

The product of its digits is 55738368, while the sum is 67.

The spelling of 187891942648 in words is "one hundred eighty-seven billion, eight hundred ninety-one million, nine hundred forty-two thousand, six hundred forty-eight".