187776990864 has 120 divisors (see below), whose sum is σ = 530965873152. Its totient is φ = 61945678080.

The previous prime is 187776990829. The next prime is 187776990871. The reversal of 187776990864 is 468099677781.

187776990864 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a junction number, because it is equal to n+sod(n) for n = 187776990792 and 187776990801.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7022929 + ... + 7049615.

Almost surely, 2^187776990864 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 187776990864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (265482936576).

187776990864 is an abundant number, since it is smaller than the sum of its proper divisors (343188882288).

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

187776990864 is a wasteful number, since it uses less digits than its factorization.

187776990864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27205 (or 27196 counting only the distinct ones).

The product of its (nonzero) digits is 256048128, while the sum is 72.

The spelling of 187776990864 in words is "one hundred eighty-seven billion, seven hundred seventy-six million, nine hundred ninety thousand, eight hundred sixty-four".