621699164 has 24 divisors (see below), whose sum is σ = 1106008848. Its totient is φ = 305712000.

The previous prime is 621699149. The next prime is 621699167. The reversal of 621699164 is 461996126.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621699167) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 205664 + ... + 208664.

It is an arithmetic number, because the mean of its divisors is an integer number (46083702).

Almost surely, 2^621699164 is an apocalyptic number.

It is an amenable number.

621699164 is a deficient number, since it is larger than the sum of its proper divisors (484309684).

621699164 is a wasteful number, since it uses less digits than its factorization.

621699164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3845 (or 3843 counting only the distinct ones).

The product of its digits is 139968, while the sum is 44.

The square root of 621699164 is about 24933.8958849194. The cubic root of 621699164 is about 853.4801557398.

The spelling of 621699164 in words is "six hundred twenty-one million, six hundred ninety-nine thousand, one hundred sixty-four".