866786278250628 has 72 divisors (see below), whose sum is σ = 2272325053602240. Its totient is φ = 288911946869280.

The previous prime is 866786278250623. The next prime is 866786278250687. The reversal of 866786278250628 is 826052872687668.

866786278250628 is a `hidden beast` number, since 8 + 6 + 6 + 7 + 8 + 6 + 2 + 7 + 82 + 506 + 28 = 666.

It is a Harshad number since it is a multiple of its sum of digits (81).

It is not an unprimeable number, because it can be changed into a prime (866786278250623) by changing a digit.

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, 9227043 + ... + 42646346.

It is an arithmetic number, because the mean of its divisors is an integer number (31560070188920).

Almost surely, 2^{866786278250628} is an apocalyptic number.

It is an amenable number.

866786278250628 is an abundant number, since it is smaller than the sum of its proper divisors (1405538775351612).

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

866786278250628 is a wasteful number, since it uses less digits than its factorization.

866786278250628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51890599 (or 51890585 counting only the distinct ones).

The product of its (nonzero) digits is 10404495360, while the sum is 81.

The spelling of 866786278250628 in words is "eight hundred sixty-six trillion, seven hundred eighty-six billion, two hundred seventy-eight million, two hundred fifty thousand, six hundred twenty-eight".