641730 has 16 divisors (see below), whose sum is σ = 1540224. Its totient is φ = 171120.

The previous prime is 641713. The next prime is 641747. The reversal of 641730 is 37146.

It is an interprime number because it is at equal distance from previous prime (641713) and next prime (641747).

It is a nialpdrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 641697 and 641706.

It is an unprimeable number.

641730 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10666 + ... + 10725.

It is an arithmetic number, because the mean of its divisors is an integer number (96264).

2⁶⁴¹⁷³⁰ is an apocalyptic number.

641730 is an abundant number, since it is smaller than the sum of its proper divisors (898494).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

641730 is a wasteful number, since it uses less digits than its factorization.

641730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21401.

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

The square root of 641730 is about 801.0805202974. The cubic root of 641730 is about 86.2549671577.

Adding to 641730 its reverse (37146), we get a palindrome (678876).

It can be divided in two parts, 6417 and 30, that multiplied together give a triangular number (192510 = T₆₂₀).

The spelling of 641730 in words is "six hundred forty-one thousand, seven hundred thirty".