78620385 has 24 divisors (see below), whose sum is σ = 132770880. Its totient is φ = 39721248.

The previous prime is 78620317. The next prime is 78620387. The reversal of 78620385 is 58302687.

It is not a de Polignac number, because 78620385 - 2¹⁰ = 78619361 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78620387) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1845 + ... + 12674.

It is an arithmetic number, because the mean of its divisors is an integer number (5532120).

Almost surely, 2^78620385 is an apocalyptic number.

It is an amenable number.

78620385 is a deficient number, since it is larger than the sum of its proper divisors (54150495).

78620385 is a wasteful number, since it uses less digits than its factorization.

78620385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14565 (or 14546 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 39.

The square root of 78620385 is about 8866.8136892573. The cubic root of 78620385 is about 428.3956530755.

The spelling of 78620385 in words is "seventy-eight million, six hundred twenty thousand, three hundred eighty-five".