78321398 has 8 divisors (see below), whose sum is σ = 120347640. Its totient is φ = 38205520.

The previous prime is 78321349. The next prime is 78321413. The reversal of 78321398 is 89312387.

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

It is a super-2 number, since 2×78321398² = 12268482769348808, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 477488 + ... + 477651.

It is an arithmetic number, because the mean of its divisors is an integer number (15043455).

Almost surely, 2^78321398 is an apocalyptic number.

78321398 is a deficient number, since it is larger than the sum of its proper divisors (42026242).

78321398 is a wasteful number, since it uses less digits than its factorization.

78321398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 955182.

The product of its digits is 72576, while the sum is 41.

The square root of 78321398 is about 8849.9377398940. The cubic root of 78321398 is about 427.8519118209.

The spelling of 78321398 in words is "seventy-eight million, three hundred twenty-one thousand, three hundred ninety-eight".