699678 has 40 divisors (see below), whose sum is σ = 1794672. Its totient is φ = 199584.

The previous prime is 699649. The next prime is 699697. The reversal of 699678 is 876996.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

699678 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 826 + ... + 1442.

2⁶⁹⁹⁶⁷⁸ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 699678, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (897336).

699678 is an abundant number, since it is smaller than the sum of its proper divisors (1094994).

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

699678 is a wasteful number, since it uses less digits than its factorization.

699678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 638 (or 629 counting only the distinct ones).

The product of its digits is 163296, while the sum is 45.

The square root of 699678 is about 836.4675725932. The cubic root of 699678 is about 88.7767835581.

The spelling of 699678 in words is "six hundred ninety-nine thousand, six hundred seventy-eight".