699664 has 20 divisors (see below), whose sum is σ = 1549504. Its totient is φ = 299808.

The previous prime is 699649. The next prime is 699697. The reversal of 699664 is 466996.

699664 = T₅₁ + T₅₂ + ... + T₁₆₂.

It is an unprimeable number.

699664 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3012 + ... + 3235.

2⁶⁹⁹⁶⁶⁴ is an apocalyptic number.

It is an amenable number.

699664 is an abundant number, since it is smaller than the sum of its proper divisors (849840).

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

699664 is a wasteful number, since it uses less digits than its factorization.

699664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6262 (or 6256 counting only the distinct ones).

The product of its digits is 69984, while the sum is 40.

The square root of 699664 is about 836.4592040261. The cubic root of 699664 is about 88.7761914366.

It can be divided in two parts, 6996 and 64, that multiplied together give a palindrome (447744).

The spelling of 699664 in words is "six hundred ninety-nine thousand, six hundred sixty-four".