78539400769 has 4 divisors (see below), whose sum is σ = 78795229744. Its totient is φ = 78283571796.

The previous prime is 78539400761. The next prime is 78539400773. The reversal of 78539400769 is 96700493587.

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 not a de Polignac number, because 78539400769 - 2³ = 78539400761 is a prime.

It is a super-2 number, since 2×78539400769² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78539400761) 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, 127914027 + ... + 127914640.

It is an arithmetic number, because the mean of its divisors is an integer number (19698807436).

Almost surely, 2^78539400769 is an apocalyptic number.

It is an amenable number.

78539400769 is a deficient number, since it is larger than the sum of its proper divisors (255828975).

78539400769 is a wasteful number, since it uses less digits than its factorization.

78539400769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255828974.

The product of its (nonzero) digits is 11430720, while the sum is 58.

The spelling of 78539400769 in words is "seventy-eight billion, five hundred thirty-nine million, four hundred thousand, seven hundred sixty-nine".