78497395091780 has 96 divisors (see below), whose sum is σ = 191952437935104. Its totient is φ = 26405030006784.

The previous prime is 78497395091779. The next prime is 78497395091783. The reversal of 78497395091780 is 8719059379487.

It is not an unprimeable number, because it can be changed into a prime (78497395091783) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 494040629 + ... + 494199491.

It is an arithmetic number, because the mean of its divisors is an integer number (1999504561824).

Almost surely, 2^{78497395091780} is an apocalyptic number.

78497395091780 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

78497395091780 is an abundant number, since it is smaller than the sum of its proper divisors (113455042843324).

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

78497395091780 is a wasteful number, since it uses less digits than its factorization.

78497395091780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225525 (or 225523 counting only the distinct ones).

The product of its (nonzero) digits is 960180480, while the sum is 77.

The spelling of 78497395091780 in words is "seventy-eight trillion, four hundred ninety-seven billion, three hundred ninety-five million, ninety-one thousand, seven hundred eighty".