626641 has 4 divisors (see below), whose sum is σ = 632500. Its totient is φ = 620784.

The previous prime is 626629. The next prime is 626663. The reversal of 626641 is 146626.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 176400 + 450241 = 420^2 + 671^2 .

It is a cyclic number.

It is not a de Polignac number, because 626641 - 2⁵ = 626609 is a prime.

It is a pancake number, because a pancake can be divided into 626641 parts by 1119 straight cuts.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (626611) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 2766 + ... + 2983.

It is an arithmetic number, because the mean of its divisors is an integer number (158125).

2⁶²⁶⁶⁴¹ is an apocalyptic number.

It is an amenable number.

626641 is a deficient number, since it is larger than the sum of its proper divisors (5859).

626641 is a wasteful number, since it uses less digits than its factorization.

626641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5858.

The product of its digits is 1728, while the sum is 25.

The square root of 626641 is about 791.6065942120. The cubic root of 626641 is about 85.5735604867.

The spelling of 626641 in words is "six hundred twenty-six thousand, six hundred forty-one".