731647 has 8 divisors (see below), whose sum is σ = 843776. Its totient is φ = 621432.

The previous prime is 731639. The next prime is 731651. The reversal of 731647 is 746137.

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

It is not a de Polignac number, because 731647 - 2³ = 731639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (731047) 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, 478 + ... + 1300.

It is an arithmetic number, because the mean of its divisors is an integer number (105472).

2⁷³¹⁶⁴⁷ is an apocalyptic number.

731647 is a deficient number, since it is larger than the sum of its proper divisors (112129).

731647 is a wasteful number, since it uses less digits than its factorization.

731647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 957.

The product of its digits is 3528, while the sum is 28.

The square root of 731647 is about 855.3636653494. The cubic root of 731647 is about 90.1087984648.

It can be divided in two parts, 731 and 647, that added together give a triangular number (1378 = T₅₂).

The spelling of 731647 in words is "seven hundred thirty-one thousand, six hundred forty-seven".