78806473 has 4 divisors (see below), whose sum is σ = 78824340. Its totient is φ = 78788608.

The previous prime is 78806461. The next prime is 78806479. The reversal of 78806473 is 37460887.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 54125449 + 24681024 = 7357^2 + 4968^2 .

It is a cyclic number.

It is not a de Polignac number, because 78806473 - 2²⁵ = 45252041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78806479) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2973 + ... + 12901.

It is an arithmetic number, because the mean of its divisors is an integer number (19706085).

Almost surely, 2^78806473 is an apocalyptic number.

It is an amenable number.

78806473 is a deficient number, since it is larger than the sum of its proper divisors (17867).

78806473 is an equidigital number, since it uses as much as digits as its factorization.

78806473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17866.

The product of its (nonzero) digits is 225792, while the sum is 43.

The square root of 78806473 is about 8877.3009974879. The cubic root of 78806473 is about 428.7333792116.

The spelling of 78806473 in words is "seventy-eight million, eight hundred six thousand, four hundred seventy-three".