78506833 has 8 divisors (see below), whose sum is σ = 84694248. Its totient is φ = 72493824.

The previous prime is 78506821. The next prime is 78506839. The reversal of 78506833 is 33860587.

It can be written as a sum of positive squares in 4 ways, for example, as 32171584 + 46335249 = 5672^2 + 6807^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 78506833 - 2⁵ = 78506801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78506839) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42666 + ... + 44467.

It is an arithmetic number, because the mean of its divisors is an integer number (10586781).

Almost surely, 2^78506833 is an apocalyptic number.

It is an amenable number.

78506833 is a deficient number, since it is larger than the sum of its proper divisors (6187415).

78506833 is a wasteful number, since it uses less digits than its factorization.

78506833 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87203.

The product of its (nonzero) digits is 120960, while the sum is 40.

The square root of 78506833 is about 8860.4081734421. The cubic root of 78506833 is about 428.1893087051.

The spelling of 78506833 in words is "seventy-eight million, five hundred six thousand, eight hundred thirty-three".