78116643 has 40 divisors (see below), whose sum is σ = 129152496. Its totient is φ = 46656000.

The previous prime is 78116641. The next prime is 78116659. The reversal of 78116643 is 34661187.

78116643 is a `hidden beast` number, since 7 + 8 + 1 + 1 + 6 + 643 = 666.

It is not a de Polignac number, because 78116643 - 2¹ = 78116641 is a prime.

It is a super-2 number, since 2×78116643² = 12204419827178898, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78116598 and 78116607.

It is not an unprimeable number, because it can be changed into a prime (78116641) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 64443 + ... + 65643.

Almost surely, 2^78116643 is an apocalyptic number.

78116643 is a gapful number since it is divisible by the number (73) formed by its first and last digit.

78116643 is a deficient number, since it is larger than the sum of its proper divisors (51035853).

78116643 is a wasteful number, since it uses less digits than its factorization.

78116643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1297 (or 1288 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 78116643 is about 8838.3620088792. The cubic root of 78116643 is about 427.4787431720.

It can be divided in two parts, 781 and 16643, that added together give a square (17424 = 132²).

The spelling of 78116643 in words is "seventy-eight million, one hundred sixteen thousand, six hundred forty-three".