641654 has 32 divisors (see below), whose sum is σ = 1149120. Its totient is φ = 266112.

The previous prime is 641639. The next prime is 641681. The reversal of 641654 is 456146.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is an unprimeable number.

641654 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17324 + ... + 17360.

It is an arithmetic number, because the mean of its divisors is an integer number (35910).

2⁶⁴¹⁶⁵⁴ is an apocalyptic number.

641654 is a deficient number, since it is larger than the sum of its proper divisors (507466).

641654 is a wasteful number, since it uses less digits than its factorization.

641654 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104.

The product of its digits is 2880, while the sum is 26.

The square root of 641654 is about 801.0330829622. The cubic root of 641654 is about 86.2515619685.

The spelling of 641654 in words is "six hundred forty-one thousand, six hundred fifty-four".