78620515012 has 48 divisors (see below), whose sum is σ = 149910611760. Its totient is φ = 36075945984.

The previous prime is 78620514899. The next prime is 78620515019. The reversal of 78620515012 is 21051502687.

It can be written as a sum of positive squares in 8 ways, for example, as 28759411396 + 49861103616 = 169586^2 + 223296^2 .

It is not an unprimeable number, because it can be changed into a prime (78620515019) 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 15 ways as a sum of consecutive naturals, for example, 1494468 + ... + 1546180.

It is an arithmetic number, because the mean of its divisors is an integer number (3123137745).

Almost surely, 2^78620515012 is an apocalyptic number.

It is an amenable number.

78620515012 is a deficient number, since it is larger than the sum of its proper divisors (71290096748).

78620515012 is a wasteful number, since it uses less digits than its factorization.

78620515012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51929 (or 51901 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 37.

The spelling of 78620515012 in words is "seventy-eight billion, six hundred twenty million, five hundred fifteen thousand, twelve".