864123145720 has 32 divisors (see below), whose sum is σ = 1944373734000. Its totient is φ = 345632075008.

The previous prime is 864123145703. The next prime is 864123145759. The reversal of 864123145720 is 27541321468.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 293556 + ... + 1347004.

Almost surely, 2^864123145720 is an apocalyptic number.

It is an amenable number.

864123145720 is an abundant number, since it is smaller than the sum of its proper divisors (1080250588280).

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

864123145720 is a wasteful number, since it uses less digits than its factorization.

864123145720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1073967 (or 1073963 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 43.

The spelling of 864123145720 in words is "eight hundred sixty-four billion, one hundred twenty-three million, one hundred forty-five thousand, seven hundred twenty".