621704 has 8 divisors (see below), whose sum is σ = 1165710. Its totient is φ = 310848.

The previous prime is 621703. The next prime is 621721. The reversal of 621704 is 407126.

It can be written as a sum of positive squares in only one way, i.e., 532900 + 88804 = 730^2 + 298^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38849 + ... + 38864.

2⁶²¹⁷⁰⁴ is an apocalyptic number.

It is an amenable number.

621704 is a deficient number, since it is larger than the sum of its proper divisors (544006).

621704 is a wasteful number, since it uses less digits than its factorization.

621704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77719 (or 77715 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 621704 is about 788.4820860362. The cubic root of 621704 is about 85.3482368718.

The spelling of 621704 in words is "six hundred twenty-one thousand, seven hundred four".