678940279 has 16 divisors (see below), whose sum is σ = 708744960. Its totient is φ = 649851840.

The previous prime is 678940219. The next prime is 678940307. The reversal of 678940279 is 972049876.

It is a cyclic number.

It is not a de Polignac number, because 678940279 - 2¹³ = 678932087 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678940219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1205652 + ... + 1206214.

It is an arithmetic number, because the mean of its divisors is an integer number (44296560).

Almost surely, 2^678940279 is an apocalyptic number.

678940279 is a deficient number, since it is larger than the sum of its proper divisors (29804681).

678940279 is a wasteful number, since it uses less digits than its factorization.

678940279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1110.

The product of its (nonzero) digits is 1524096, while the sum is 52.

The square root of 678940279 is about 26056.4824755760. The cubic root of 678940279 is about 878.9088917586.

The spelling of 678940279 in words is "six hundred seventy-eight million, nine hundred forty thousand, two hundred seventy-nine".