78775034389 has 4 divisors (see below), whose sum is σ = 79215118560. Its totient is φ = 78334950220.

The previous prime is 78775034363. The next prime is 78775034407. The reversal of 78775034389 is 98343057787.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78775034389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78775034329) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 220041817 + ... + 220042174.

It is an arithmetic number, because the mean of its divisors is an integer number (19803779640).

Almost surely, 2^78775034389 is an apocalyptic number.

It is an amenable number.

78775034389 is a deficient number, since it is larger than the sum of its proper divisors (440084171).

78775034389 is a wasteful number, since it uses less digits than its factorization.

78775034389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440084170.

The product of its (nonzero) digits is 35562240, while the sum is 61.

The spelling of 78775034389 in words is "seventy-eight billion, seven hundred seventy-five million, thirty-four thousand, three hundred eighty-nine".