678787398 has 32 divisors (see below), whose sum is σ = 1560434400. Its totient is φ = 218459808.

The previous prime is 678787391. The next prime is 678787411. The reversal of 678787398 is 893787876.

678787398 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×678787398² = 921504663367220808, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678787391) 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, 215161 + ... + 218292.

It is an arithmetic number, because the mean of its divisors is an integer number (48763575).

Almost surely, 2^678787398 is an apocalyptic number.

678787398 is an abundant number, since it is smaller than the sum of its proper divisors (881647002).

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

678787398 is a wasteful number, since it uses less digits than its factorization.

678787398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433493 (or 433487 counting only the distinct ones).

The product of its digits is 28449792, while the sum is 63.

The square root of 678787398 is about 26053.5486642415. The cubic root of 678787398 is about 878.8429171011.

The spelling of 678787398 in words is "six hundred seventy-eight million, seven hundred eighty-seven thousand, three hundred ninety-eight".