678236394 has 32 divisors (see below), whose sum is σ = 1481458176. Its totient is φ = 205294320.

The previous prime is 678236371. The next prime is 678236401. The reversal of 678236394 is 493632876.

It is a super-2 number, since 2×678236394² = 920009212292246472, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58509 + ... + 69135.

It is an arithmetic number, because the mean of its divisors is an integer number (46295568).

Almost surely, 2^678236394 is an apocalyptic number.

678236394 is an abundant number, since it is smaller than the sum of its proper divisors (803221782).

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

678236394 is a wasteful number, since it uses less digits than its factorization.

678236394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11610.

The product of its digits is 1306368, while the sum is 48.

The square root of 678236394 is about 26042.9720654153. The cubic root of 678236394 is about 878.6050532026.

The spelling of 678236394 in words is "six hundred seventy-eight million, two hundred thirty-six thousand, three hundred ninety-four".