78503428672 has 28 divisors (see below), whose sum is σ = 155859447996. Its totient is φ = 39231756800.

The previous prime is 78503428643. The next prime is 78503428691. The reversal of 78503428672 is 27682430587.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 50635800576 + 27867628096 = 225024^2 + 166936^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 184579 + ... + 437122.

It is an arithmetic number, because the mean of its divisors is an integer number (5566408857).

Almost surely, 2^78503428672 is an apocalyptic number.

It is an amenable number.

78503428672 is a deficient number, since it is larger than the sum of its proper divisors (77356019324).

78503428672 is a wasteful number, since it uses less digits than its factorization.

78503428672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 623686 (or 623676 counting only the distinct ones).

The product of its (nonzero) digits is 4515840, while the sum is 52.

The spelling of 78503428672 in words is "seventy-eight billion, five hundred three million, four hundred twenty-eight thousand, six hundred seventy-two".