78298390738 has 16 divisors (see below), whose sum is σ = 117551702520. Its totient is φ = 39114510336.

The previous prime is 78298390733. The next prime is 78298390741. The reversal of 78298390738 is 83709389287.

It can be written as a sum of positive squares in 4 ways, for example, as 75538674649 + 2759716089 = 274843^2 + 52533^2 .

It is a super-2 number, since 2×78298390738² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78298390738.

It is not an unprimeable number, because it can be changed into a prime (78298390733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20640970 + ... + 20644762.

Almost surely, 2^78298390738 is an apocalyptic number.

78298390738 is a deficient number, since it is larger than the sum of its proper divisors (39253311782).

78298390738 is a wasteful number, since it uses less digits than its factorization.

78298390738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10221.

The product of its (nonzero) digits is 36578304, while the sum is 64.

The spelling of 78298390738 in words is "seventy-eight billion, two hundred ninety-eight million, three hundred ninety thousand, seven hundred thirty-eight".