78364740452 has 6 divisors (see below), whose sum is σ = 137138295798. Its totient is φ = 39182370224.

The previous prime is 78364740439. The next prime is 78364740473. The reversal of 78364740452 is 25404746387.

It can be written as a sum of positive squares in only one way, i.e., 59801767936 + 18562972516 = 244544^2 + 136246^2 .

It is a super-2 number, since 2×78364740452² (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 78364740452.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9795592553 + ... + 9795592560.

It is an arithmetic number, because the mean of its divisors is an integer number (22856382633).

Almost surely, 2^78364740452 is an apocalyptic number.

It is an amenable number.

78364740452 is a deficient number, since it is larger than the sum of its proper divisors (58773555346).

78364740452 is a wasteful number, since it uses less digits than its factorization.

78364740452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19591185117 (or 19591185115 counting only the distinct ones).

The product of its (nonzero) digits is 4515840, while the sum is 50.

The spelling of 78364740452 in words is "seventy-eight billion, three hundred sixty-four million, seven hundred forty thousand, four hundred fifty-two".