678605390 has 16 divisors (see below), whose sum is σ = 1226562480. Its totient is φ = 270314880.

The previous prime is 678605359. The next prime is 678605393. The reversal of 678605390 is 93506876.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678605393) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 138380 + ... + 143199.

It is an arithmetic number, because the mean of its divisors is an integer number (76660155).

Almost surely, 2^678605390 is an apocalyptic number.

678605390 is a deficient number, since it is larger than the sum of its proper divisors (547957090).

678605390 is a wasteful number, since it uses less digits than its factorization.

678605390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281827.

The product of its (nonzero) digits is 272160, while the sum is 44.

The square root of 678605390 is about 26050.0554701905. The cubic root of 678605390 is about 878.7643599854.

The spelling of 678605390 in words is "six hundred seventy-eight million, six hundred five thousand, three hundred ninety".