188878490647 has 32 divisors (see below), whose sum is σ = 253649977344. Its totient is φ = 136237701600.

The previous prime is 188878490621. The next prime is 188878490651. The reversal of 188878490647 is 746094878881.

It is not a de Polignac number, because 188878490647 - 2¹⁵ = 188878457879 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (188878490617) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1665273 + ... + 1775074.

It is an arithmetic number, because the mean of its divisors is an integer number (7926561792).

Almost surely, 2^188878490647 is an apocalyptic number.

188878490647 is a deficient number, since it is larger than the sum of its proper divisors (64771486697).

188878490647 is a wasteful number, since it uses less digits than its factorization.

188878490647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3440419.

The product of its (nonzero) digits is 173408256, while the sum is 70.

The spelling of 188878490647 in words is "one hundred eighty-eight billion, eight hundred seventy-eight million, four hundred ninety thousand, six hundred forty-seven".