78723806 has 32 divisors (see below), whose sum is σ = 141626880. Its totient is φ = 32104800.

The previous prime is 78723797. The next prime is 78723809. The reversal of 78723806 is 60832787.

It is a super-3 number, since 3×78723806³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78723809) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27461 + ... + 30191.

It is an arithmetic number, because the mean of its divisors is an integer number (4425840).

Almost surely, 2^78723806 is an apocalyptic number.

78723806 is a deficient number, since it is larger than the sum of its proper divisors (62903074).

78723806 is a wasteful number, since it uses less digits than its factorization.

78723806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2840.

The product of its (nonzero) digits is 112896, while the sum is 41.

The square root of 78723806 is about 8872.6436871994. The cubic root of 78723806 is about 428.5834147865.

The spelling of 78723806 in words is "seventy-eight million, seven hundred twenty-three thousand, eight hundred six".