78534089865 has 432 divisors, whose sum is σ = 190610050176. Its totient is φ = 30259215360.

The previous prime is 78534089863. The next prime is 78534089891. The reversal of 78534089865 is 56898043587.

78534089865 is a `hidden beast` number, since 7 + 8 + 534 + 0 + 8 + 98 + 6 + 5 = 666.

It is not a de Polignac number, because 78534089865 - 2¹ = 78534089863 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78534089863) by changing a digit.

It is a polite number, since it can be written in 431 ways as a sum of consecutive naturals, for example, 1172150562 + ... + 1172150628.

It is an arithmetic number, because the mean of its divisors is an integer number (441226968).

Almost surely, 2^78534089865 is an apocalyptic number.

It is an amenable number.

78534089865 is an abundant number, since it is smaller than the sum of its proper divisors (112075960311).

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

78534089865 is a wasteful number, since it uses less digits than its factorization.

78534089865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200 (or 110 counting only the distinct ones).

The product of its (nonzero) digits is 58060800, while the sum is 63.

The spelling of 78534089865 in words is "seventy-eight billion, five hundred thirty-four million, eighty-nine thousand, eight hundred sixty-five".