78329292388 has 6 divisors (see below), whose sum is σ = 137076261686. Its totient is φ = 39164646192.

The previous prime is 78329292359. The next prime is 78329292443. The reversal of 78329292388 is 88329292387.

It can be written as a sum of positive squares in only one way, i.e., 65729678884 + 12599613504 = 256378^2 + 112248^2 .

It is a super-2 number, since 2×78329292388² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9791161545 + ... + 9791161552.

Almost surely, 2^78329292388 is an apocalyptic number.

It is an amenable number.

78329292388 is a deficient number, since it is larger than the sum of its proper divisors (58746969298).

78329292388 is a wasteful number, since it uses less digits than its factorization.

78329292388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19582323101 (or 19582323099 counting only the distinct ones).

The product of its digits is 20901888, while the sum is 61.

Subtracting 78329292388 from its reverse (88329292387), we obtain a palindrome (9999999999).

The spelling of 78329292388 in words is "seventy-eight billion, three hundred twenty-nine million, two hundred ninety-two thousand, three hundred eighty-eight".