621970 has 24 divisors (see below), whose sum is σ = 1178532. Its totient is φ = 236160.

The previous prime is 621941. The next prime is 621983. The reversal of 621970 is 79126.

It can be written as a sum of positive squares in 6 ways, for example, as 84681 + 537289 = 291^2 + 733^2 .

It is an unprimeable number.

621970 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15150 + ... + 15190.

2⁶²¹⁹⁷⁰ is an apocalyptic number.

621970 is a deficient number, since it is larger than the sum of its proper divisors (556562).

621970 is a wasteful number, since it uses less digits than its factorization.

621970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126 (or 85 counting only the distinct ones).

The product of its (nonzero) digits is 756, while the sum is 25.

The square root of 621970 is about 788.6507465285. The cubic root of 621970 is about 85.3604073977.

The spelling of 621970 in words is "six hundred twenty-one thousand, nine hundred seventy".