78341770816 has 63 divisors (see below), whose sum is σ = 158406142801. Its totient is φ = 38442036224.

The previous prime is 78341770813. The next prime is 78341770861. The reversal of 78341770816 is 61807714387.

It is a happy number.

The square root of 78341770816 is 279896.

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

It can be written as a sum of positive squares in only one way, i.e., 48171470400 + 30170300416 = 219480^2 + 173696^2 .

It is a super-2 number, since 2×78341770816² (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 (78341770813) 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, 132110616 + ... + 132111208.

Almost surely, 2^78341770816 is an apocalyptic number.

78341770816 is the 279896-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78341770816

78341770816 is an abundant number, since it is smaller than the sum of its proper divisors (80064371985).

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

78341770816 is an frugal number, since it uses more digits than its factorization.

78341770816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1316 (or 654 counting only the distinct ones).

The product of its (nonzero) digits is 1580544, while the sum is 52.

The spelling of 78341770816 in words is "seventy-eight billion, three hundred forty-one million, seven hundred seventy thousand, eight hundred sixteen".