662731 has 4 divisors (see below), whose sum is σ = 671200. Its totient is φ = 654264.

The previous prime is 662719. The next prime is 662743. The reversal of 662731 is 137266.

662731 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 137266 = 2 ⋅68633.

It is an interprime number because it is at equal distance from previous prime (662719) and next prime (662743).

It is a cyclic number.

It is not a de Polignac number, because 662731 - 2¹¹ = 660683 is a prime.

It is a super-2 number, since 2×662731² = 878424756722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 662696 and 662705.

It is not an unprimeable number, because it can be changed into a prime (662771) 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, 4116 + ... + 4273.

It is an arithmetic number, because the mean of its divisors is an integer number (167800).

2⁶⁶²⁷³¹ is an apocalyptic number.

662731 is a deficient number, since it is larger than the sum of its proper divisors (8469).

662731 is an equidigital number, since it uses as much as digits as its factorization.

662731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8468.

The product of its digits is 1512, while the sum is 25.

The square root of 662731 is about 814.0829196095. The cubic root of 662731 is about 87.1858010015.

Adding to 662731 its reverse (137266), we get a palindrome (799997).

The spelling of 662731 in words is "six hundred sixty-two thousand, seven hundred thirty-one".