678388402 has 8 divisors (see below), whose sum is σ = 1023676416. Its totient is φ = 337162932.

The previous prime is 678388391. The next prime is 678388411. The reversal of 678388402 is 204883876.

678388402 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a super-2 number, since 2×678388402² = 920421647936227208, which contains 22 as substring.

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, 1015218 + ... + 1015885.

It is an arithmetic number, because the mean of its divisors is an integer number (127959552).

Almost surely, 2^678388402 is an apocalyptic number.

678388402 is a deficient number, since it is larger than the sum of its proper divisors (345288014).

678388402 is a wasteful number, since it uses less digits than its factorization.

678388402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2031272.

The product of its (nonzero) digits is 516096, while the sum is 46.

The square root of 678388402 is about 26045.8903092215. The cubic root of 678388402 is about 878.6706866709.

The spelling of 678388402 in words is "six hundred seventy-eight million, three hundred eighty-eight thousand, four hundred two".