78285993 has 16 divisors (see below), whose sum is σ = 108820800. Its totient is φ = 49999040.

The previous prime is 78285953. The next prime is 78286001. The reversal of 78285993 is 39958287.

It is a cyclic number.

It is not a de Polignac number, because 78285993 - 2⁹ = 78285481 is a prime.

It is a super-2 number, since 2×78285993² = 12257393399992098, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78285923) 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, 7963 + ... + 14831.

It is an arithmetic number, because the mean of its divisors is an integer number (6801300).

Almost surely, 2^78285993 is an apocalyptic number.

It is an amenable number.

78285993 is a deficient number, since it is larger than the sum of its proper divisors (30534807).

78285993 is a wasteful number, since it uses less digits than its factorization.

78285993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7032.

The product of its digits is 1088640, while the sum is 51.

The square root of 78285993 is about 8847.9372172275. The cubic root of 78285993 is about 427.7874322940.

The spelling of 78285993 in words is "seventy-eight million, two hundred eighty-five thousand, nine hundred ninety-three".