78766420 has 12 divisors (see below), whose sum is σ = 165409524. Its totient is φ = 31506560.

The previous prime is 78766417. The next prime is 78766439. The reversal of 78766420 is 2466787.

It can be written as a sum of positive squares in 2 ways, for example, as 52099524 + 26666896 = 7218^2 + 5164^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1969141 + ... + 1969180.

It is an arithmetic number, because the mean of its divisors is an integer number (13784127).

Almost surely, 2^78766420 is an apocalyptic number.

It is an amenable number.

78766420 is an abundant number, since it is smaller than the sum of its proper divisors (86643104).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78766420 is a wasteful number, since it uses less digits than its factorization.

78766420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3938330 (or 3938328 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 40.

The square root of 78766420 is about 8875.0447886194. The cubic root of 78766420 is about 428.6607330299.

The spelling of 78766420 in words is "seventy-eight million, seven hundred sixty-six thousand, four hundred twenty".