78431888767684 has 27 divisors (see below), whose sum is σ = 137870187858543. Its totient is φ = 39041185423368.

The previous prime is 78431888767681. The next prime is 78431888767717. The reversal of 78431888767684 is 48676788813487.

The square root of 78431888767684 is 8856178.

It is a perfect power (a square), and thus also a powerful number.

It is a super-2 number, since 2×78431888767684² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78431888767681) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 4020695059 + ... + 4020714565.

Almost surely, 2^{78431888767684} is an apocalyptic number.

78431888767684 is the 8856178-th square number.

It is an amenable number.

78431888767684 is a deficient number, since it is larger than the sum of its proper divisors (59438299090859).

78431888767684 is an frugal number, since it uses more digits than its factorization.

78431888767684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39472 (or 19736 counting only the distinct ones).

The product of its digits is 19421724672, while the sum is 85.

The spelling of 78431888767684 in words is "seventy-eight trillion, four hundred thirty-one billion, eight hundred eighty-eight million, seven hundred sixty-seven thousand, six hundred eighty-four".