78305643 has 36 divisors (see below), whose sum is σ = 126584760. Its totient is φ = 47820240.

The previous prime is 78305641. The next prime is 78305699. The reversal of 78305643 is 34650387.

It is a happy number.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

78305643 is a `hidden beast` number, since 7 + 8 + 3 + 0 + 5 + 643 = 666.

It is not a de Polignac number, because 78305643 - 2¹ = 78305641 is a prime.

It is a super-2 number, since 2×78305643² = 12263547451286898, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78305598 and 78305607.

It is not an unprimeable number, because it can be changed into a prime (78305641) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 597688 + ... + 597818.

Almost surely, 2^78305643 is an apocalyptic number.

78305643 is a deficient number, since it is larger than the sum of its proper divisors (48279117).

78305643 is a wasteful number, since it uses less digits than its factorization.

78305643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 297 (or 147 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 36.

The square root of 78305643 is about 8849.0475758694. The cubic root of 78305643 is about 427.8232212413.

The spelling of 78305643 in words is "seventy-eight million, three hundred five thousand, six hundred forty-three".