78698082985636 has 27 divisors (see below), whose sum is σ = 141545632749507. Its totient is φ = 38285234521920.

The previous prime is 78698082985619. The next prime is 78698082985661. The reversal of 78698082985636 is 63658928089687.

The square root of 78698082985636 is 8871194.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 47687173248100 + 31010909737536 = 6905590^2 + 5568744^2 .

It is a super-2 number, since 2×78698082985636² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 656408416 + ... + 656528296.

Almost surely, 2^{78698082985636} is an apocalyptic number.

78698082985636 is the 8871194-th square number.

It is an amenable number.

78698082985636 is a deficient number, since it is larger than the sum of its proper divisors (62847549763871).

78698082985636 is an frugal number, since it uses more digits than its factorization.

78698082985636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239840 (or 119920 counting only the distinct ones).

The product of its (nonzero) digits is 15049359360, while the sum is 85.

The spelling of 78698082985636 in words is "seventy-eight trillion, six hundred ninety-eight billion, eighty-two million, nine hundred eighty-five thousand, six hundred thirty-six".