867380128650 has 336 divisors, whose sum is σ = 2853640355328. Its totient is φ = 191861136000.

The previous prime is 867380128649. The next prime is 867380128679. The reversal of 867380128650 is 56821083768.

867380128650 is a `hidden beast` number, since 86 + 7 + 380 + 128 + 65 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 167 ways as a sum of consecutive naturals, for example, 7854820 + ... + 7964480.

It is an arithmetic number, because the mean of its divisors is an integer number (8492977248).

Almost surely, 2^867380128650 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 867380128650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1426820177664).

867380128650 is an abundant number, since it is smaller than the sum of its proper divisors (1986260226678).

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

867380128650 is a wasteful number, since it uses less digits than its factorization.

867380128650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109729 (or 109709 counting only the distinct ones).

The product of its (nonzero) digits is 3870720, while the sum is 54.

The spelling of 867380128650 in words is "eight hundred sixty-seven billion, three hundred eighty million, one hundred twenty-eight thousand, six hundred fifty".