621616 has 10 divisors (see below), whose sum is σ = 1204412. Its totient is φ = 310800.

The previous prime is 621611. The next prime is 621617. The reversal of 621616 is 616126.

It is not an unprimeable number, because it can be changed into a prime (621611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19410 + ... + 19441.

2⁶²¹⁶¹⁶ is an apocalyptic number.

It is an amenable number.

621616 is a deficient number, since it is larger than the sum of its proper divisors (582796).

621616 is a wasteful number, since it uses less digits than its factorization.

621616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38859 (or 38853 counting only the distinct ones).

The product of its digits is 432, while the sum is 22.

The square root of 621616 is about 788.4262806376. The cubic root of 621616 is about 85.3442097682.

The spelling of 621616 in words is "six hundred twenty-one thousand, six hundred sixteen".