621905216 has 28 divisors (see below), whose sum is σ = 1262798592. Its totient is φ = 303719808.

The previous prime is 621905209. The next prime is 621905227. The reversal of 621905216 is 612509126.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 110240 + ... + 115743.

Almost surely, 2^621905216 is an apocalyptic number.

It is an amenable number.

621905216 is an abundant number, since it is smaller than the sum of its proper divisors (640893376).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

621905216 is a wasteful number, since it uses less digits than its factorization.

621905216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226038 (or 226028 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 621905216 is about 24938.0275082052. The cubic root of 621905216 is about 853.5744359952.

The spelling of 621905216 in words is "six hundred twenty-one million, nine hundred five thousand, two hundred sixteen".