78820067776 has 28 divisors (see below), whose sum is σ = 160045986232. Its totient is φ = 38493520128.

The previous prime is 78820067719. The next prime is 78820067779. The reversal of 78820067776 is 67776002887.

It is a super-3 number, since 3×78820067776³ (a number of 34 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78820067776.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78820067779) 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, 14317755 + ... + 14323258.

Almost surely, 2^78820067776 is an apocalyptic number.

It is an amenable number.

78820067776 is an abundant number, since it is smaller than the sum of its proper divisors (81225918456).

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

78820067776 is a wasteful number, since it uses less digits than its factorization.

78820067776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28641068 (or 28641058 counting only the distinct ones).

The product of its (nonzero) digits is 11063808, while the sum is 58.

The spelling of 78820067776 in words is "seventy-eight billion, eight hundred twenty million, sixty-seven thousand, seven hundred seventy-six".