85643007864 has 64 divisors (see below), whose sum is σ = 226927850400. Its totient is φ = 26841636864.

The previous prime is 85643007859. The next prime is 85643007899. The reversal of 85643007864 is 46870034658.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 307654 + ... + 515690.

Almost surely, 2^85643007864 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 85643007864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (113463925200).

85643007864 is an abundant number, since it is smaller than the sum of its proper divisors (141284842536).

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

85643007864 is a wasteful number, since it uses less digits than its factorization.

85643007864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209072 (or 209068 counting only the distinct ones).

The product of its (nonzero) digits is 3870720, while the sum is 51.

The spelling of 85643007864 in words is "eighty-five billion, six hundred forty-three million, seven thousand, eight hundred sixty-four".