78920806 has 4 divisors (see below), whose sum is σ = 118381212. Its totient is φ = 39460402.

The previous prime is 78920801. The next prime is 78920837. The reversal of 78920806 is 60802987.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 60802987 = 7 ⋅8686141.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78920801) 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 as a sum of consecutive naturals, namely, 19730200 + ... + 19730203.

It is an arithmetic number, because the mean of its divisors is an integer number (29595303).

Almost surely, 2^78920806 is an apocalyptic number.

78920806 is a deficient number, since it is larger than the sum of its proper divisors (39460406).

78920806 is a wasteful number, since it uses less digits than its factorization.

78920806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39460405.

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 78920806 is about 8883.7382897066. The cubic root of 78920806 is about 428.9406155179.

Subtracting from 78920806 its sum of digits (40), we obtain a triangular number (78920766 = T₁₂₅₆₃).

The spelling of 78920806 in words is "seventy-eight million, nine hundred twenty thousand, eight hundred six".