678720146 has 32 divisors (see below), whose sum is σ = 1108598400. Its totient is φ = 309792384.

The previous prime is 678720137. The next prime is 678720151. The reversal of 678720146 is 641027876.

It is a super-2 number, since 2×678720146² = 921322073172522632, 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, 1205261 + ... + 1205823.

It is an arithmetic number, because the mean of its divisors is an integer number (34643700).

Almost surely, 2^678720146 is an apocalyptic number.

678720146 is a deficient number, since it is larger than the sum of its proper divisors (429878254).

678720146 is a wasteful number, since it uses less digits than its factorization.

678720146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1010.

The product of its (nonzero) digits is 112896, while the sum is 41.

The square root of 678720146 is about 26052.2579827546. The cubic root of 678720146 is about 878.8138918638.

The spelling of 678720146 in words is "six hundred seventy-eight million, seven hundred twenty thousand, one hundred forty-six".