78656770 has 64 divisors (see below), whose sum is σ = 155364480. Its totient is φ = 28574208.

The previous prime is 78656749. The next prime is 78656771. The reversal of 78656770 is 7765687.

It is a self number, because there is not a number n which added to its sum of digits gives 78656770.

It is not an unprimeable number, because it can be changed into a prime (78656771) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 735057 + ... + 735163.

It is an arithmetic number, because the mean of its divisors is an integer number (2427570).

Almost surely, 2^78656770 is an apocalyptic number.

78656770 is a deficient number, since it is larger than the sum of its proper divisors (76707710).

78656770 is a wasteful number, since it uses less digits than its factorization.

78656770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259.

The product of its (nonzero) digits is 493920, while the sum is 46.

The square root of 78656770 is about 8868.8652036210. The cubic root of 78656770 is about 428.4617291189.

The spelling of 78656770 in words is "seventy-eight million, six hundred fifty-six thousand, seven hundred seventy".