978736593506 has 12 divisors (see below), whose sum is σ = 1707795484758. Its totient is φ = 419458540032.

The previous prime is 978736593493. The next prime is 978736593509. The reversal of 978736593506 is 605395637879.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 966074717881 + 12661875625 = 982891^2 + 112525^2 .

It is not an unprimeable number, because it can be changed into a prime (978736593509) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4993553951 + ... + 4993554146.

Almost surely, 2^978736593506 is an apocalyptic number.

978736593506 is a deficient number, since it is larger than the sum of its proper divisors (729058891252).

978736593506 is a wasteful number, since it uses less digits than its factorization.

978736593506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9987108113 (or 9987108106 counting only the distinct ones).

The product of its (nonzero) digits is 257191200, while the sum is 68.

The spelling of 978736593506 in words is "nine hundred seventy-eight billion, seven hundred thirty-six million, five hundred ninety-three thousand, five hundred six".