78398068 has 48 divisors (see below), whose sum is σ = 164150784. Its totient is φ = 32060160.

The previous prime is 78398059. The next prime is 78398069. The reversal of 78398068 is 86089387.

It is a happy number.

It is a super-2 number, since 2×78398068² = 12292514132265248, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78398069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53230 + ... + 54682.

It is an arithmetic number, because the mean of its divisors is an integer number (3419808).

Almost surely, 2^78398068 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78398068, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82075392).

78398068 is an abundant number, since it is smaller than the sum of its proper divisors (85752716).

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

78398068 is a wasteful number, since it uses less digits than its factorization.

78398068 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1552 (or 1550 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 49.

The square root of 78398068 is about 8854.2683492201. The cubic root of 78398068 is about 427.9914765240.

The spelling of 78398068 in words is "seventy-eight million, three hundred ninety-eight thousand, sixty-eight".