864721287612 has 240 divisors, whose sum is σ = 2783582968320. Its totient is φ = 227946503808.

The previous prime is 864721287487. The next prime is 864721287631. The reversal of 864721287612 is 216782127468.

864721287612 is a `hidden beast` number, since 8 + 6 + 4 + 7 + 2 + 12 + 8 + 7 + 612 = 666.

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

It is a congruent number.

It is an unprimeable number.

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 79 ways as a sum of consecutive naturals, for example, 72495193 + ... + 72507119.

It is an arithmetic number, because the mean of its divisors is an integer number (11598262368).

Almost surely, 2^864721287612 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 864721287612, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1391791484160).

864721287612 is an abundant number, since it is smaller than the sum of its proper divisors (1918861680708).

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

864721287612 is a wasteful number, since it uses less digits than its factorization.

864721287612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14422 (or 14411 counting only the distinct ones).

The product of its digits is 3612672, while the sum is 54.

The spelling of 864721287612 in words is "eight hundred sixty-four billion, seven hundred twenty-one million, two hundred eighty-seven thousand, six hundred twelve".