78196489780 has 24 divisors (see below), whose sum is σ = 164251893960. Its totient is φ = 31271116800.

The previous prime is 78196489759. The next prime is 78196489793. The reversal of 78196489780 is 8798469187.

It can be written as a sum of positive squares in 4 ways, for example, as 3564806436 + 74631683344 = 59706^2 + 273188^2 .

It is a super-2 number, since 2×78196489780² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 381325 + ... + 549364.

It is an arithmetic number, because the mean of its divisors is an integer number (6843828915).

Almost surely, 2^78196489780 is an apocalyptic number.

It is an amenable number.

78196489780 is an abundant number, since it is smaller than the sum of its proper divisors (86055404180).

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

78196489780 is a wasteful number, since it uses less digits than its factorization.

78196489780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 934899 (or 934897 counting only the distinct ones).

The product of its (nonzero) digits is 48771072, while the sum is 67.

The spelling of 78196489780 in words is "seventy-eight billion, one hundred ninety-six million, four hundred eighty-nine thousand, seven hundred eighty".