80634643 has 4 divisors (see below), whose sum is σ = 80842320. Its totient is φ = 80426968.

The previous prime is 80634641. The next prime is 80634647. The reversal of 80634643 is 34643608.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 80634643 - 2¹ = 80634641 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 80634599 and 80634608.

It is not an unprimeable number, because it can be changed into a prime (80634641) by changing a digit.

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, 103255 + ... + 104032.

It is an arithmetic number, because the mean of its divisors is an integer number (20210580).

Almost surely, 2^80634643 is an apocalyptic number.

80634643 is a deficient number, since it is larger than the sum of its proper divisors (207677).

80634643 is a wasteful number, since it uses less digits than its factorization.

80634643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207676.

The product of its (nonzero) digits is 41472, while the sum is 34.

The square root of 80634643 is about 8979.6794486218. The cubic root of 80634643 is about 432.0233522899.

The spelling of 80634643 in words is "eighty million, six hundred thirty-four thousand, six hundred forty-three".