78298390818 has 12 divisors (see below), whose sum is σ = 169646513478. Its totient is φ = 26099463600.

The previous prime is 78298390801. The next prime is 78298390853. The reversal of 78298390818 is 81809389287.

78298390818 is a `hidden beast` number, since 7 + 82 + 98 + 390 + 81 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 40098861009 + 38199529809 = 200247^2 + 195447^2 .

It is a super-2 number, since 2×78298390818² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2174955283 + ... + 2174955318.

Almost surely, 2^78298390818 is an apocalyptic number.

78298390818 is an abundant number, since it is smaller than the sum of its proper divisors (91348122660).

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

78298390818 is a wasteful number, since it uses less digits than its factorization.

78298390818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4349910609 (or 4349910606 counting only the distinct ones).

The product of its (nonzero) digits is 13934592, while the sum is 63.

The spelling of 78298390818 in words is "seventy-eight billion, two hundred ninety-eight million, three hundred ninety thousand, eight hundred eighteen".