78243385 has 16 divisors (see below), whose sum is σ = 102643200. Its totient is φ = 56784640.

The previous prime is 78243383. The next prime is 78243397. The reversal of 78243385 is 58334287.

It is not a de Polignac number, because 78243385 - 2¹ = 78243383 is a prime.

It is a super-2 number, since 2×78243385² = 12244054592516450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78243383) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31416 + ... + 33814.

It is an arithmetic number, because the mean of its divisors is an integer number (6415200).

Almost surely, 2^78243385 is an apocalyptic number.

It is an amenable number.

78243385 is a deficient number, since it is larger than the sum of its proper divisors (24399815).

78243385 is a wasteful number, since it uses less digits than its factorization.

78243385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3008.

The product of its digits is 161280, while the sum is 40.

The square root of 78243385 is about 8845.5290966680. The cubic root of 78243385 is about 427.7098088946.

The spelling of 78243385 in words is "seventy-eight million, two hundred forty-three thousand, three hundred eighty-five".