621634 has 8 divisors (see below), whose sum is σ = 1004220. Its totient is φ = 286896.

The previous prime is 621631. The next prime is 621641. The reversal of 621634 is 436126.

It can be written as a sum of positive squares in 2 ways, for example, as 497025 + 124609 = 705^2 + 353^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (621631) 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, 11929 + ... + 11980.

2⁶²¹⁶³⁴ is an apocalyptic number.

621634 is a deficient number, since it is larger than the sum of its proper divisors (382586).

621634 is a wasteful number, since it uses less digits than its factorization.

621634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23924.

The product of its digits is 864, while the sum is 22.

The square root of 621634 is about 788.4376956995. The cubic root of 621634 is about 85.3450335248.

The spelling of 621634 in words is "six hundred twenty-one thousand, six hundred thirty-four".