78398486 has 8 divisors (see below), whose sum is σ = 120776160. Its totient is φ = 38139768.

The previous prime is 78398483. The next prime is 78398533. The reversal of 78398486 is 68489387.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×78398486² = 12292645214184392, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78398483) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 529646 + ... + 529793.

It is an arithmetic number, because the mean of its divisors is an integer number (15097020).

Almost surely, 2^78398486 is an apocalyptic number.

78398486 is a deficient number, since it is larger than the sum of its proper divisors (42377674).

78398486 is a wasteful number, since it uses less digits than its factorization.

78398486 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1059478.

The product of its digits is 2322432, while the sum is 53.

The square root of 78398486 is about 8854.2919536234. The cubic root of 78398486 is about 427.9922371725.

Subtracting from 78398486 its reverse (68489387), we obtain a palindrome (9909099).

The spelling of 78398486 in words is "seventy-eight million, three hundred ninety-eight thousand, four hundred eighty-six".