78320771934 has 32 divisors (see below), whose sum is σ = 162295695360. Its totient is φ = 25170828000.

The previous prime is 78320771923. The next prime is 78320771939. The reversal of 78320771934 is 43917702387.

It is a happy number.

It is a super-2 number, since 2×78320771934² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78320771939) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 732642 + ... + 832709.

It is an arithmetic number, because the mean of its divisors is an integer number (5071740480).

Almost surely, 2^78320771934 is an apocalyptic number.

78320771934 is an abundant number, since it is smaller than the sum of its proper divisors (83974923426).

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

78320771934 is a wasteful number, since it uses less digits than its factorization.

78320771934 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1565656.

The product of its (nonzero) digits is 1778112, while the sum is 51.

The spelling of 78320771934 in words is "seventy-eight billion, three hundred twenty million, seven hundred seventy-one thousand, nine hundred thirty-four".