78428806 has 16 divisors (see below), whose sum is σ = 120683520. Its totient is φ = 38208520.

The previous prime is 78428771. The next prime is 78428807. The reversal of 78428806 is 60882487.

It is a super-2 number, since 2×78428806² = 12302155221171272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78428807) 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 7 ways as a sum of consecutive naturals, for example, 20721 + ... + 24211.

It is an arithmetic number, because the mean of its divisors is an integer number (7542720).

Almost surely, 2^78428806 is an apocalyptic number.

78428806 is a deficient number, since it is larger than the sum of its proper divisors (42254714).

78428806 is a wasteful number, since it uses less digits than its factorization.

78428806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3779.

The product of its (nonzero) digits is 172032, while the sum is 43.

The square root of 78428806 is about 8856.0039521220. The cubic root of 78428806 is about 428.0474042757.

The spelling of 78428806 in words is "seventy-eight million, four hundred twenty-eight thousand, eight hundred six".