731663 has 8 divisors (see below), whose sum is σ = 782208. Its totient is φ = 681984.

The previous prime is 731651. The next prime is 731681. The reversal of 731663 is 366137.

731663 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-731663 is a prime.

It is a Duffinian number.

It is a plaindrome in base 9.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 731663.

It is not an unprimeable number, because it can be changed into a prime (731603) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3170 + ... + 3392.

It is an arithmetic number, because the mean of its divisors is an integer number (97776).

2⁷³¹⁶⁶³ is an apocalyptic number.

731663 is a deficient number, since it is larger than the sum of its proper divisors (50545).

731663 is a wasteful number, since it uses less digits than its factorization.

731663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433.

The product of its digits is 2268, while the sum is 26.

The square root of 731663 is about 855.3730180453. The cubic root of 731663 is about 90.1094553071.

The spelling of 731663 in words is "seven hundred thirty-one thousand, six hundred sixty-three".