662691 has 4 divisors (see below), whose sum is σ = 883592. Its totient is φ = 441792.

The previous prime is 662689. The next prime is 662693. The reversal of 662691 is 196266.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (662689) and next prime (662693).

It is not a de Polignac number, because 662691 - 2¹ = 662689 is a prime.

It is a super-2 number, since 2×662691² = 878318722962, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 662691.

It is not an unprimeable number, because it can be changed into a prime (662693) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 110446 + ... + 110451.

It is an arithmetic number, because the mean of its divisors is an integer number (220898).

2⁶⁶²⁶⁹¹ is an apocalyptic number.

662691 is a deficient number, since it is larger than the sum of its proper divisors (220901).

662691 is a wasteful number, since it uses less digits than its factorization.

662691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220900.

The product of its digits is 3888, while the sum is 30.

The square root of 662691 is about 814.0583517169. The cubic root of 662691 is about 87.1840468950.

The spelling of 662691 in words is "six hundred sixty-two thousand, six hundred ninety-one".