64731 has 4 divisors (see below), whose sum is σ = 86312. Its totient is φ = 43152.

The previous prime is 64717. The next prime is 64747. The reversal of 64731 is 13746.

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

It is not a de Polignac number, because 64731 - 2⁶ = 64667 is a prime.

It is a super-2 number, since 2×64731² = 8380204722, which contains 22 as substring.

It is a d-powerful number, because it can be written as 6⁶ + 4⁵ + 7⁵ + 3⁵ + 1 .

It is a D-number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 64698 and 64707.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 64731.

It is not an unprimeable number, because it can be changed into a prime (64781) 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, 10786 + ... + 10791.

It is an arithmetic number, because the mean of its divisors is an integer number (21578).

2⁶⁴⁷³¹ is an apocalyptic number.

64731 is a deficient number, since it is larger than the sum of its proper divisors (21581).

64731 is a wasteful number, since it uses less digits than its factorization.

64731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21580.

The product of its digits is 504, while the sum is 21.

The square root of 64731 is about 254.4228763299. The cubic root of 64731 is about 40.1517154993.

The spelling of 64731 in words is "sixty-four thousand, seven hundred thirty-one".