78307478852 has 6 divisors (see below), whose sum is σ = 137038087998. Its totient is φ = 39153739424.

The previous prime is 78307478813. The next prime is 78307478891. The reversal of 78307478852 is 25887470387.

It is an interprime number because it is at equal distance from previous prime (78307478813) and next prime (78307478891).

It can be written as a sum of positive squares in only one way, i.e., 71896914496 + 6410564356 = 268136^2 + 80066^2 .

It is a super-2 number, since 2×78307478852² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78307478791 and 78307478800.

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, 9788434853 + ... + 9788434860.

It is an arithmetic number, because the mean of its divisors is an integer number (22839681333).

Almost surely, 2^78307478852 is an apocalyptic number.

It is an amenable number.

78307478852 is a deficient number, since it is larger than the sum of its proper divisors (58730609146).

78307478852 is a wasteful number, since it uses less digits than its factorization.

78307478852 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19576869717 (or 19576869715 counting only the distinct ones).

The product of its (nonzero) digits is 21073920, while the sum is 59.

The spelling of 78307478852 in words is "seventy-eight billion, three hundred seven million, four hundred seventy-eight thousand, eight hundred fifty-two".